Check with the Airline

• Some airlines will require a note from the doctor before allowing a noticeably pregnant woman to fly. After week 36, some airlines might prohibit flying all together. Check with the airline before making your plans.
  
  

Obtain Doctor Permission

• Inform your doctor of your travel plans. In the third trimester, the biggest concern is being away from the doctor and the hospital in the event that labor begins---unless there have been other pregnancy complications.
  
  

Take Your Records

• The American Pregnancy Association recommends taking a copy of your prenatal records with you when traveling. If a complication arises or labor begins, having your records will help prevent delays in treatment.
  
  

Stay Hydrated

• During the flight, stay hydrated, because even mild dehydration can cause contractions, according to the American Pregnancy Association. Due to the lack of humidity in airline cabins, it is likely your fluid intake will need to be increased beyond your normal levels.
  
  

Stretch and Walk

• To prevent blood clots and reduce swelling, the Mayo Clinic advises that you stretch your legs often during the flight, preferably by walking down the aisles. If this is not possible, stretch your legs while sitting.