Which iPad would best suit me? (iPad Air 2 or iPad pro?)

I recently sold my iMac and MacBook Air and am just using my iPad mini 2 (16GB). I am a student who is graduating next year so I don't really see myself using a computer anymore.

So far this year the iPad mini has all I need for schooling. I am thinking about trading up for a pro or air 2. I need a bigger screen and more storage space for it to be my primary "computer". Also I am an aspiring pilot and a cellular iPad would be useful for certain flight apps while flying.

Is the iPad pro really worth the $1000+ for my situation? Or would the iPad Air 2 be worthy of doing everything I need it for? I also want a keyboard. Are there iPad Air 2 keyboards that are fairly decent?

Thanks.