A quick internet search suggests 36 weeks (eight months), which is well into the third trimester, is the most common start of restrictions, and many airlines will accept a doctor’s note the woman is low risk even past that. It was a 2008 election blip when the media got ahold of Sarah Palin flying while in labor because she wanted her special-needs baby delivered by the medical team that had prepared for him, which suggests even the written restrictions in airline policy are not consistently enforced.
A quick internet search suggests 36 weeks (eight months), which is well into the third trimester, is the most common start of restrictions, and many airlines will accept a doctor’s note the woman is low risk even past that. It was a 2008 election blip when the media got ahold of Sarah Palin flying while in labor because she wanted her special-needs baby delivered by the medical team that had prepared for him, which suggests even the written restrictions in airline policy are not consistently enforced.