Here are some general “before the flight” tips:
  Before a woman is going to go somewhere by air, she should ask her doctor’s advise as well as discuss all potential risks of this flight, which refer to her particular pregnancy situation, because there are some either health conditions, like gestation diabetes, or pregnancy conditions, like pregnancy with multiples, when a woman should keep from traveling by air;
  It should be pointed out, that any air travel during the last month and a half of pregnancy can result in premature delivery;
  There are airlines, which require all pregnant women over 35 weeks gestation have a note from her doctor of approval for flying, and some of them do not let women fly after the 35th pregnancy week;
  Before flying somewhere, any pregnant woman should check her insurance policy, as some of them do not cover pregnancy;
  It is necessary for a pregnant woman to arrange with the airline for a bulkhead seat or for a seat near an exit for extra leg room.
 Here are some precautions for pregnant women to take into consideration:
  A woman should talk to her practitioner before she is going to go somewhere by air. In case if she is more than 36 week pregnant, most airlines will not let her fly because of the fear of delivering on board;
  It is necessary for a woman to try to do the greater part of her traveling during the second pregnancy trimester. And should be done not because then she will feel more comfort, but because of the general risk of miscarriage (which can occur during the first pregnancy trimester) or preterm delivery (which can occur during the third pregnancy trimester;
  Any excessive flying should be avoided by any pregnant womanþ

Here are the general rules of how a pregnant woman should behave, while she is on a plane board:
It is important to make comfort arrangements. A woman, who is expecting should have seats with more room to stretch her legs, she should take into consideration the ability to walk in the aisles, etc;
It is possible that turbulence can shake the plane, so, a woman is to make sure that she is holding on to the seat backs while walking along the aisle;
The bathroom are extremely small, this is why it may become a challenge to use them for a pregnant woman. So, she should better hold on something, which provides support, as she can experience turbulence while being in the restroom;
During pregnancy a woman may choose an aisle seat, which would let her get up easier in order to be able to stretch or get to the bathroom;
In case if a pregnant woman decides to go somewhere by airplane, she should keep her air travels on major airlines, in which there are pressurized cabins and she should avoid flying by smaller private planes, therefore, in case if there is no way out and a woman has to ride in smaller planes, then she is to avoid altitudes above 7,000 feet;
Seat belt is to be worn under the belly and it is to be stretched across the lap;
Because the circulation of a pregnant woman is under the strain, she should stretch and more her legs regularly while seated. Besides wearing support stocking during the flight should also be taken into consideration;
In order to reduce the risk of dehydration, a pregnant woman should consume plenty of water while she is on a plane board. In addition, keeping up fluid intake will help to reduce the risk of deep vein thrombosis;
Anemia is a usual pregnancy complication. This is why in case if a woman feels either short of breath or light – headed, while being in the air, she should ask one of the flight attendants for a pack of special breathing oxygen.

Anyway, pregnancy is not a contraindication for air travels; however, any woman should use her common sense and tell her doctor about all her traveling plans.