Make the most of holiday-season shopping when you earn bonus miles. Frequent fliers will have to make purchases by clicking through to retailers from their airlines’ Web sites to earn the bonuses.

American Airlines is offering double miles with select retailers for purchases made with a MasterCard through Dec. 31. You can also earn a $25 gift card when you use your Master-Card online for purchases of $250 or more, while supplies last. Customers must register for this offer prior to making purchases at www.aadvantageeshopping.com/double-miles.

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Continental Airlines Chase credit or debit cardholders can earn twice the miles they usually earn when purchasing items at ShopOnePass. Visit www.continental.com/shoponepass.

Delta is offering bonus miles in combination with other promotions such as free shipping or discounts with select retailers. Visit www.skymilesshopping.com and click on Special Offers for details.

Earn more miles than usual while shopping at the United Mileage Plus Mall with select retailers such as Nordstrom, REI and Kohl’s, now through Dec. 21. You can earn additional bonuses of 1,000 miles if you spend a total of $500 to $749; 1,500 miles if you spend $750 to $999; and 2,000 miles if you spend $1,000 or more. Visit www.mponlinemall.com/holiday.

US Airways is offering up to a 250 percent bonus when you do your holiday shopping online at participating stores through Dec. 30. Earn a 50 percent bonus when you shop at one store, 100 percent when you shop at two, 150 percent when you shop at three, 200 percent when you shop at four, or 250 percent when you shop with five merchants.

The final bonus will be added to all of the purchases made during the promotional period and will apply to up to 10 purchases. Visit www.usairways.-com/en-US/dividendmiles/-promotions/holiday_partner_promo.html.

Earn double Alaska Mileage Plan miles with participating retailers, including Shoes.com and Macys.com, when you purchase at the Mileage Plan Shopping Mall. Visit www.mileageplanshopping.com/holiday for details.

Don’t forget that many airlines, including American, no longer accept cash for on-board purchases. If you are sending the kids solo this holiday season, make sure they have a prepaid debit card so they can buy snacks during the flight.

Miles are not the only bonuses you can receive from the airlines this holiday season. American Airlines passengers can enjoy free trial Internet service on Wi-Fi-equipped planes now through Dec. 31.

The offer is available for first-time users only. Visit www.gogoinflight.com, create your free trial account and when prompted for payment just enter in promo code AATRYGOGO and your free trial will be activated. AirTran and Delta have similar deals. Use promo codes AIRTRANTRYGOGO or DELTATRYGOGO.

Virgin America has teamed with Google to offer free Wi-Fi on flights now through Jan. 15. Visit www.freeholidaywifi.com for details.