

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.
Apparently she started out saying AI, then switched to A1 mid-statement. Might have been corrected privately before, but it only partially took.