http://www.austrian.com/Info/FlightP...=AT&sc_lang=en
# Flying when pregnant
#
Up to how many weeks before giving birth is it allowed to fly?

Austrian Airlines accept pregnant women who are more than four weeks from their expected due date, as birth in Central Europe occurs too early in 6 or 7 % of the cases, around the 38th pregnancy week.

Each risk pregnancy means an absolute no for flying!

A pregnant woman should consult her gynecologist or treating doctor prior to every flight during the pregnancy as there could be a higher risk of the development of a deep vein thrombosis.

https://help.cbp.gov/app/answers/det...risks-involved

Can I visit the U.S. while pregnant and what are the risks involved?

Although there are no specific regulations prohibiting pregnant foreign nationals from entering the U.S., entry is allowed or denied at the discretion of the admitting U.S. Customs and Border Protection (CBP) Officer. If the CBP Officer determines that you are likely to become a ward of the government (meaning that the government must provide medical care because you do not have medical coverage while visiting the U.S.), you can be denied entry. When determining if you will be allowed to enter the U.S., CBP Officers take into consideration the date your child is due for delivery and the length of time you intend to stay in the U.S. In addition, they want evidence that you have sufficient medical insurance to cover any medical necessities while you are in the U.S. If it is determined that you do not have sufficient medical insurance to cover any unexpected or expected medical care while in the U.S., you can be denied entry. Additionally, if you are pregnant and entering the U.S. at a border port of entry via vehicle, be aware the radiation detection portals deployed at the ports do not emit any radiation, and do not present a hazard to you and your unborn child. Coming to the U.S. for the purpose of child birth is not a valid reason for travel.