Delta Air Lines' SkyMiles program came in 2nd in a ranking of airline travel rewards programs by U.S. News & World Report.

The Delta frequent flier program came in just behind Alaska Airlines' Mileage Plan in the No. 1 spot.

Alaska Airlines' program has maintained the No. 2 position in the annual rankings for five years due to its "high award choice availability" and flights to popular destinations, according to U.S. News.

Delta's SkyMiles program has retained its No. 2 spot for three years due to its "ample member benefits," the airline's large network of destinations and high volume of daily flights.

A survey conducted by U.S. News about airline credit cards found that 48 percent of respondents estimated they've earned more than $600 in value from airline rewards by using their credit card, while more than 20 percent said they earned more than $1,200 in value.

About 1 in 3 consumers got free flights in the last year with their miles accrued through an airline credit card, according to the survey conducted through Google Surveys. But 45 percent said they wouldn't pay an annual fee for an airline credit card.

The survey of 1,000 people was conducted July 18-21.

2019-20 U.S. News Best Airline Rewards Programs 

1. Alaska Airlines Mileage Plan

2. Delta SkyMiles

3. JetBlue TrueBlue

4. United MileagePlus

5. American Airlines AAdvantage

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