Frontier Airlines made a preemptive strike against booking sites like Expedia, Travelocity and Orbitz by penalizing fliers who purchase Frontier flights anywhere except the carrierís own Web site. For customers purchasing Frontierís lowest fares through outside booking channels Ö customers will get their seat assigned at check-in, earn 50 percent EarlyReturns miles, and pay higher fees [for services like itinerary changes, unaccompanied minors and pets in the cabin].

Airline Penalizes Fliers for Using Booking Sites Ľ Have Tips, Will Travel

I normally book on the airline website but occasionally on other booking sites I've found a better fare, or better flight times using multiple airlines in one itinerary. That's when I've used other booking sites.

I wonder if this will be a new trend with other airlines jumping on board with this type of policy.