I am 29 weeks pregnant, how safe is the air travel (flight duration 5hrs with 2-3hr transit)?

You shouldn't travel during 3rd trimester.

I believe airlines recommend that pregnant women do not fly after the 27th week into pregnancy - ring the airline to be sure - personally i wouldn't fly at 29 weeks, not worth the risk. Take care x

I wouldn't unless absolutely necessary! I was in hosp at 29 weeks with my 1st preg with pre eclampsia, which can be life threatening, had my 1st and my 3rd babies at 33 weeks! With my 3rd baby my waters broke at 30 weeks! I am not that unusual as the hospital was packed with women with trouble at this stage of pregnancy!
Please take drs advice, also risk of dvt is much more!
Good luck!

Traveling late in your pregnancy, especially going on a
plane, is not a good thing. Your baby could go into fetal
distress, and make you go into early labor. So as far as air
travel, my advice is to wait until after your baby is born.
I didn't go on a plane or do any other traveling, until my
son was about two months old.