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There is a new champion among frequent flyer programs. Prostock-studio / Shutterstock.com
After a few years stuck at home avoiding COVID-19, travelers have returned to the skies with a vengeance. That means many are racking up frequent flyer miles again. Recently, financial website WalletHub looked at the loyalty rewards programs of the 10 largest domestic airlines and ranked them across 21 metrics, including airline coverage, partner coverage, rewards value and earning and redemption…