This is something I haven't seen talked about that really drove me nuts.
When you summon your sparrow while you are falling, boosting doesn't propel you until you hit the ground. I'm not sure if this is intentional or not but whatever it is it is really annoying.
In the alpha I swear you could boost while in air, maybe I'm just imagining things though.
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I always summon my Sparrow while in mid air. Boosting before touching ground would be good because during the beta my sparrow would always take a nose dive into the ground when summoned in mid air. Which I heard that you could glitch and fall through the ground and die sometimes while nose diving.