One of the most universal experiences in the Battlefield series is that of hopping into a fighter jet for the first time, taking off, and promptly nose-diving into a hill.
While in previous Battlefield games you would have to live this embarrassing moment online in front of dozens of strangers who would then mock you, now you can crash dozens of expensive military planes in the privacy of your own practice range. Battlefield 4 brings a training mode for the various jets and helicopters in the game, letting players get used to the flight controls before they go online.
Considering how finicky the air vehicles in Battlefield can handle for first-time pilots, this should be a good tool to get more players with their sky legs into online matches.