If you fly even just a couple times a year, it's worth having an airline credit card.The perks and benefits that come with these cards, such as free checked bags, priority boarding, and lounge passes, that make flying easier and more enjoyableand can save you money.We compared some of the most popular mainstream credit cards from the three big US airlinesAmerican, United, and Delta. The Citi/AAdvantage Platinum Select World Elite Mastercard and the United Explorer Card currently have the strongest welcome bonuses, and they earn bonus miles on a few different types of purchases.However, the Gold Delta SkyMiles Credit Card from American Express is gaining some valuable new benefits in early 2020 that could make it the best option.Read more personal finance coverage.One of the best ways to earn a bunch of frequent flyer miles quickly is to open an airline credit card and earn the new card member bonus.While a card that earns transferable pointslike the Chase Sapphire Preferred Card typically has more valuable and flexible rewards than fixed program cards, airline cards win in two respects.If you generally fly with one preferred airline and earn frequent flyer miles on that program when you travel, it can make sense to earn the same kind of miles from your credit card. Between the mileage earned from both, your miles will add up quicker.Also, airline credit cards come with various perks specific to that airline that can save you a ton of time and money. Things like complimentary checked bags, priority boarding, and even day passes to airport lounges will have you feeling like you're flying first class even when you're in basic economy.Each of the three major US airlines (American, Delta, and United) offer a few different credit cards, but among the most popular are the "mainstream" cards. These products have annual fees between $95 and $99often waived the first yearand feature benefits that appeal to everyone from casual fliers to road warriors.While they all have similar features and benefits and all offer a great value to cardholders, we've compared them and found that one stands out above the rest. Read on to see which one it is.Keep in mind that we're focusing on the rewards and perks that make these credit cards great options, not things like interest rates and late fees, which will far outweigh the value of any points or miles. It's important to practice financial discipline when using credit cards by paying your balances in full each month, making payments on time, and only spending what you can afford to pay back. Click here to learn more about the United Explorer Card.Click here to learn more about the Gold Delta SkyMiles card.First up is the Gold Delta SkyMiles Card from American Express.Welcome bonus: Earn 30,000 Delta miles after you make $1,000 in Delta purchases in the first three months. Plus, receive a $50 statement credit when you make a Delta purchase in the first three months.Annual fee: $0 introductory annual fee for the first year, then $95Earning miles: 2 miles per dollar spent on Delta purchases, and 1 mile per dollar on everything elseTop benefits: Free checked bag on Delta flights, priority boarding, 20% off in-flight purchases, no foreign transaction feesIn addition to the welcome offer, the Gold Delta Amex card comes with a handful of incredibly usefuland valuableperks.If you have the card open, you get a free checked bag on Delta flights, as does each other person on your reservation. Delta normally charges $30 for the first checked bag on each flightso $60 for a round-tripmeaning that for a family of four, the free checked bag benefit could save $240.The card also offers priority boarding to everyone on the cardholder's reservation. If you aren't checking a bag, that can come in usefulby boarding a little earlier, you'll get better access to the overhead compartments and won't have to worry about space running out.Other benefits include a 20% discount on in-flight purchases (in the form of a statement credit), such as food or drinks, and no foreign transaction fees.While the Gold Delta card is a great option, you may also want to consider the Platinum version (the Platinum Delta SkyMiles Credit Card from American Express). Although it has a higher annual fee $195, not waived the first yearit offers a companion pass each year on your cardmember anniversary. You can learn more about the companion pass benefit and the Platinum SkyMiles card here.Note that starting in 2020, Delta credit cards will be updated with new benefits including additional 2x bonus categories for earning miles (US supermarkets and restaurants) and a $100 Delta flight credit after you spend $10,000 on the card in a year. The Gold Delta Amex annual fee will also be increasing to $99.Click here to learn more about the Gold Delta SkyMiles card.Next is the United Explorer Card.Welcome bonus: Earn 40,000 United miles after you spend $2,000 in the first three months, and earn an additional 25,000 miles after you spend $10,000 total in purchases in the first six months.Annual fee: $0 introductory annual fee the first year, then $95Earning miles:2 miles per dollar spent on United purchases and at restaurants and on hotel stays, 1 mile per dollar on everything elseTop benefits:Free checked bag, priority boarding, two complimentary one-time United Club lounge passes each year, up to a $100 application fee credit for TSA PreCheck or Global Entry, access to additional award space, no foreign transaction feesThe United Explorer Card from Chase is a solid option for United flyers. Like the other airlines' sub-$100 cards, the United card offers a free checked bag for the cardholder. Up to two traveling companions booking at the same time can also get a free checked bag each. This is especially useful since United raised the price of a checked bag to $30.Unlike the other airlines' cards, though, you'll have to actually buy the tickets with the United card in order to get the free checked bagssimply having the card open and tied to your account isn't enough.For those who don't have luggage to check, the card offers priority boarding for everyone on your reservationyou'll get this benefit even if you pay for the tickets with another card. By boarding earlier, you can make sure to snag overhead space for your carry-on.One excellent perk with the United card is that you'll get two complimentary one-time passes to United Club lounges each year. If you get to the airport early or end up dealing with a delay, you can head to the lounge and enjoy free snacks, drinks, Wi-Fi, and more comfortable seating than what you'd find in the terminal.When you spend $25,000 in a calendar year, you'll also get a PQD waiverPQDs, or "Premier Qualifying Dollars," count toward earning elite status with the airline. When that requirement is waived, you'll earn status just based on how much you've flown, rather than a combination of how much you've flown and how much you've spent that year.The card earns 2 miles per dollar spent on all United purchases, and it also earns 2x miles on all dining and hotel spending. It will continue earning 1x mile on everything else. There are no foreign transaction fees.Other featuresinclude a fee credit to cover the cost of enrolling in Global Entry/TSA PreCheck, and a 25% discount on all in-flight United purchases.One uniquebut unpublishedperk of the card is that having it helps you access additional United award space. That means that you'll have an easier time finding the flights you want when it's time to actually use your miles.Click here to learn more about the United Explorer card.Finally there's American Airlines: the Citi/AAdvantage Platinum Select World Elite' Mastercard.Welcome bonus: Earn 50,000 American Airlines miles after you spend $2,500 in the first three months.Annual fee: $99; waived for the first 12 monthsEarning miles:2 miles per dollar spent on American Airlines purchases, at gas stations, and restaurants, 1 mile per dollar on everything elseTop benefits:Free checked bag on domestic flights, preferred boarding, 25% off in-flight food and beverages, no foreign transaction fees50,000 miles (or at least 52,500, when you factor in the miles you'll earn for completing the minimum spending requirement) can get you far on American Airlinesas long as you can find "SAAver" availability. Based on American Airlines' award chart, it's nearly enough miles for a round-trip flight to Europe or South America during peak season, a one-way ticket to Europe in business class, or at least two domestic round-trips (or more, depending on the distance).The Citi/AAdvantage Platinum card earns 2 miles per dollar spent on American Airlines purchases, and Citi also recently added a few new bonus categoriesnew card members will earn 2x miles on restaurants and at gas stations, too. You'll earn 1 mile per dollar on everything else.The card comes with a suite of useful benefits for American Airlines flyers.You and up to four companions traveling on the same reservation each get a free checked bag on domestic flights (since American Airlines is a full-service carrier, most international flights include the first checked bag for free). Because the first checked bag is usually $25 each way, this benefit can save you $50 on a round-trip itinerary.In addition, you and everyone on your reservation get preferred boardingjoining an earlier boarding zone. That gives you more time to settle inand earlier access to the overhead bins, so that you can make sure you'll have room to store your bag.A small, but useful new perk: When you spend $20,000 or more on the card in a card membership year, you'll get a $125 discount on your next American Airlines flight (that's in addition to the miles you'll earn on those purchases).The card also offers a 25% discount on in-flight purchases, such as food and drinks, and access to discounted mileage award flights.How do the cards stack up'Each card has strengths and weaknesses. Let's look at each:Delta: the Gold Delta SkyMiles card from American ExpressPros:Free first checked bag for you and any traveling companions, regardless of whether or not you use the card to buy your ticketsPriority boardingDiscounted day passes for Delta Sky Club loungesthough this benefit will be discontinued in 2020Discounts on in-flight purchasesCons:No bonus earning categories (besides Delta purchases), but this is changing in 2020, when the card will offer 2x miles on US supermarket purchases and at restaurantsNo extras (like a discount on flights, extra points, or help toward elite status) if you spend a lot on the card in a year, but in 2020 the card will add a $100 Delta flight credit when you spend $10,000 in a calendar yearUnited Airlines: the Explorer Card from ChasePros:2x miles on dining and hotels, as well as on United purchasesTwo complimentary one-time United Club lounge passes each yearPriority boarding for you and your travel companionsDiscount on in-flight purchases, Global Entry/TSA PreCheck creditAccess to additional saver-level award seatsCons:To get the first checked bag free, you'll have to use the card to buy your ticketsThe free checked bag is only extended to up to two traveling companionsthat's not helpful if you're traveling with a family of fourAmerican Airlines: the Citi/AAdvantage Platinum SelectPros:2x points on dining and gasnot just on airline purchasesOffers a solid sign-up bonusFree first checked bag for you and up to four traveling companions, regardless of whether or not you use the card to buy your ticketsPriority boarding$100 discount on an American Airlines flight if you spend $20,000 in a yearDiscount on in-flight purchasesCons:No lounge passes or discountsNo spending bonus that counts toward elite statusSo, which is best'The best card is the one for whichever airline you find the most useful. Although there are some differences between them, each of these cards comes with a version of free checked bags and priority boarding, which are the most valuable reasons to have the cards. Plus, they help you earn more milesand quickly.However, if you're ambivalent about your choice of airline, the Citi/AAdvantage card for American Airlines is probably the most appealing card right now.Between 2x miles on several categories and a solid sign-up bonus, this card represents a great value. However, keep in mind that it's always possible that the sign-up bonus increases at some point in the future, although there's no guarantee.However, starting on January 30, 2020, the Gold Delta Amex will give the Citi AAdvantage card a run for its money thanks to the introduction of new bonus categories and perks.As benefits continue to be added and removedand, crucially, as sign-up bonuses and welcome offers fluctuatethis evaluation could always change. One way or another, an airline card is a must-have and represents significant value for anyone who flies even just a few times a year.Click here to learn more about the United Explorer card.Click here to learn more about the Gold Delta SkyMiles card.This content is not provided by the card issuers. Any opinions, analyses, reviews or recommendations expressed here are those of the authors' alone, and have not been reviewed, approved or otherwise endorsed by any issuer.More credit card coverageWhat's the best airline credit card'The best cash-back credit cardsSouthwest credit card reviewBest rewards credit cards
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