My daughter is 29 years old and is expecting her first child in September 1996. She travels by air frequently. To my knowledge, there have been no reports that show that air travel is hazardous to the well-being of the fetus. Women who should not travel far from home during a pregnancy are those with a history of problems during pregnancy or who have medical problems which might complicate a pregnancy.
Stress is always a concern, though.
She should allow plenty of rest periods, plan frequent trips to the bathroom, and stretch her legs a few times every hour. If she begins to experience any low back pain, cramping or any spotting, she should seek out a care provider in the area and not try to make it back home. Even in confined areas, exercise is important. It is a good idea to do simple isometric muscle strengthening exercises while traveling by car or airplane. Pelvic rock is an excellent one for pregnant women.