During the third trimester (25 to 40 weeks), many healthcare providers and midwives advise staying within a 300-mile radius of home because of potential problems such as high blood pressure, phlebitis, and false or preterm labor.
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Most commercial airlines allow pregnant women to fly up to 36 weeks of gestation. Some restrict pregnant women from international flights earlier in gestation and some require documentation of gestational age. For specific airline requirements, women should check with the individual carrier.