When is it safe to go on an airplane

Patient: Hi, i’m getting an arthroscopy done on my right knee to remove a plice, and i was wondering if i can get your advise on when it would be safe to go on an airplane for about 7 hours. the reason i ask, is because i’m scheduled to go to singapore from melbourne australia 10 days post surgery. I’m 17 years old and am not over weight. I have above average flexibility and am 6’3.