"...planes dont allow 9 month pregnant women on them?"
Tell that to Sarah Palin. You betcha!
"And so at a little more than eight months' pregnant, 43 years' old, with a Down Syndrome unborn child, Sarah Palin made an extraordinary decision. She was going to fly from Alaska to Texas and back in the last month of pregnancy. This is usually prohibited by airlines and strongly advised against by doctors. Palin's own doctor, Cathy Baldwin-Johnson, insisted (when she was prepared to talk to the press) that Palin did not ask her whether it was OK to fly. Many airlines bar pregnant women from flying in their final month of pregnancy because of the obvious risk of labor beginning mid-flight. But at eight months' pregnant with a special needs child, a child who would need special attention during any delivery, Palin flew a total of over 8,000 miles on commercial planes, risking a delivery in mid-air without a doctor or nurse, which could have been very dangerous and even fatal to her child."