I have *never* heard of anyone being allowed to wear their baby in the air. I have *only* heard of FAs telling people that the wraps/slings are not approved and cannot be used.
DS's first flight was at 17 months. We went the cheap way. I was miserable. My arms were sore for DAYS. Sure, he nursed to sleep twice. But who got to hold him? That would be me. Who couldn't move while he was asleep b/c I so so so did not want him to wake up? That would be me. Who is 5'3" with short legs who got to be on her tippytoes so her lap was straight to reduce some of the work her arms were doing in holding DS? Again, me.
It was NOT a good start to our vacation, and we didn't
budget anything for problems, so I dreaded the flight home the whole time. That flight he didn't sleep much and was his usual strong self and it took all I had, strength-wise, to keep him from bugging other passengers.
Not the best way to get home, either.
And if there had been a burst of sudden, violent, turbulence, who knows if I would have been able to hold him? If there were light turbulence to give me warning, and I was holding onto him well, maybe. If it was a big huge air pocket that slammed the plane suddenly, and if I was adjusting my grip or whatever, I imagine there would have been a flying baby.
Buy the seat.