Some people like to, oh, I don't know, listen to music without having to stream and waste a whole bunch of their 3-way shared account's data. Or, maybe, and just bear with me here, not have to deal with poor coverage because they live in a deadzone and can't always get 4 bars of LTE. » 8/07/14 8:55pm 8/07/14 8:55pm

Airplanes climb at one of two specific speeds, Vx and Vy. Vx is the speed that gets you the most altitude in the least distance, and is slower than Vy. It is used on initial climbout, but quickly transitioned to Vy from. Vy is the speed at which you get the best climb rate, regardless of distance. » 7/14/14 11:02pm 7/14/14 11:02pm