Hi: I am sorry about your grandmother, I am new here, but wanted to jump in to say that my OS gave me the ok to travel to Japan (an eleven hour flight) just over 8 weeks post TKR, as long as I got up and walked around the airplane every two hours or so and wore compression socks (b/c of DVT concern). I went to Japan, where I did a fair amount of walking, using a cane (but that was mostly because my arthritic non-replaced knee was bugging me a lot) and had a wonderful time and no problems or regrets. So, I'd ask your doc, as it may be fine...