Thank you so much for following up on this! :thumbsup:
I am the original poster and was just checking back to see if there was an update.
We've had several successful flights using our EFTA rear facing. We flew Air Canada, Southwest and United and had no questions asked whatsoever. However, I didn't like flying with the possibility of a hassle. The sticker on our seat is no longer visible, its a good place for an address label
and we brought with us the manual, and TC info just in case there were questions. The seat installed easily in the various sized aircraft we were on, the only potential problem is the seat in front can't recline much, but I doubt that is any different than other rear racing seats.