Is it safe to travel via airplane during pregnancy?
I would not travel on an airplane after 22 weeks unless I was seeking better medical treatment or if a parent has died and I was going to the funeral. Not worth the risk for frippery trips or business travel, IMHO. I would add that one of the concerns for flying while pregnant is your increased risk of blood clots. You are already at increased risk and a long trip or lots of sitting (I envision Oprah on the tarmac for 4 hours in an airplane without a/c) can increase that risk, theoretically.
