I did when I was 30 weeks. from Oklahoma to Arizona. The second flight was terrible bcuz it was so packed and my youngest wanted to sit on my lap

and check with the airline itself they have their own set of rules

you can but just ask doctor

you can until your third trimester but really they don't want you too after 36 weeks

It depends how far along you are. I believe the doctor and airlines don't like you to in your third trimester. Other than that it's safe.

^^^ You also can't fly in your 3rd trimester I believe

You have to talk to your doctor before you fly.