Re: flying after surgery – indeed it sucks. I had to do a similar length flight after an ACL reconstruction (with 2 changeovers), which is a much lighter surgery. Could not have imagined flying 2 days after my THR.
I’m 3 weeks further along in the process. Good luck with the PT! Mine has been a bit up & down, as my physio initially overestimated how quickly I could progress with exercises. My new motto is now “If in doubt, leave it out” and progress has been smoother.
Personally I’ve found trekking poles (with rubber feet for pavement) great – not only allows me to walk further, but the extra arm movement really does give a tiny cardio boost.