“Mobile is by far the fastest growing, and it's about 20% of our direct bookings, 20% to 25% of our direct bookings,” Delta president Glen Hauenstein told investors on the earnings call. “And it seems like every week and every month that moves on, mobile becomes a bigger and bigger chunk of total booking.

That seemingly flies in the face – pardon the pun – of the J.D. Power findings. The survey company revealed that airline apps ranked below hotel, online travel agency and rental car apps in customer satisfaction.

Related: Travel apps have much room for improvement