It will get better. I am almost five months out on the first knee and three months out on the second. I travel extensively for my job, and my first flight was four weeks after my first TKR. I had the second TKR six weeks after the first, then after another month flew south for a cruise. I've been back on the road ever since. I just give myself a little extra time since I'm still in the healing process and deninitely moving slower than before.

Is it different? Yes, it is. Everything is different. Do I get tired? You bet I do. Much more than before, but I know this is temporary. And, while much of the rest of me may be suffering... my knees are not the problem!

(Sorry OP that we've gone a bit off topic. I just want to reassure people with bionic parts that that travel is still possible, at least from my recent experience.)