There is no medical reason not to fly after CABG other than it is uncomfortable and you don't want to be in an airplane and having a complication, ie rapid heart rate
, drainage from an incision
, or having chest pain
even though it is likely just incision pain.
Also, you will not be able to carry a suitcase.
If you must fly, i allow it at 2 weeks after office visit. Better to wait 6-8 weeks.