Got miles? ExpertFlyer.com gives frequent fliers the behind-the-flight know-how to get even better award flights and upgrades than they hoped for.

What's hot: Having access to an abundance of flight info. ExpertFlyer is a paid service (basic plan $4.99 a month, premium plan $9.99 a month) that enables you to search flight awards and upgrades on 21 global airlines, as diverse as Aer Lingus and United. We particularly liked seeing how many award seats were still available on a flight and researching a flight based on which seat you want.

What's not: You can't book the award seat on ExpertFlyer. The service mainly arms frequent fliers with knowledge before they spend their miles.

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