Originally Posted by
A319 V2500
I guess in theory you could do it while still at the gate before turning off Airplane Mode (which I had to do on my two most recent A321 flights) but even then it’s not the most elegant solution as it doesn’t work perfectly in my experience.
You are right, it's not fool-proof. I've had several flights where the home page (from AAinflight) would not open until airborne, and one where the WiFi network was not even broadcasting. I know you can get some internet options (like AA pages) without buying anything, and I was hoping the SMS authorization code might also get through. I did have one time where after closing everything down after a code never came, I re-opened and tried again, and it worked without a code. YMMV on this for sure!