Commercial flights are normally safe for mother and foetus. However, air travel is not recommended in the last month of pregnancy and until 7 days after delivery. Most airlines restrict the acceptance of pregnant women. The common guidelines for uncomplicated pregnancy are, for single pregnancies, until the 35th week and for multiple pregnancies, until the 32nd week. A letter from a doctor or midwife confirming good health and expected date of delivery should be made available for verification beyond the 28th week of pregnancy. Medical clearance is required for pregnant women if delivery is expected in less than 5 weeks after the departure date or if any complications in delivery may be expected.