L.A.
The night travel would probably be better since she'll be sleepy. They probably won't allow they baby bjorn... they wouldn't when my kids were babes (now 10,7 & 5).
The reason is that in an emergency you are attached and you'll squish the baby. We had a contraption that was a vest, but the baby was on a tether rather than directly attached to the body... so in an emergency you could lower the baby away from you, but still be attached.... okay not a great description.
It was called the Baby B'air - and at the time the only approved flight harness. There maybe more by now.
http://www.amazon.com/Baby-BAir-Infant-Size-Flight/dp/B00...
L.