shoot, i started playing tennis at age 6 and never had a website ! that must have been what held me back
i've never considered the effect of air pressure on tennis racquets but combining my tennis and engineering experience now i still fail to see what effect it would have (ignoring the pressurization of the cargo area).
would anyone care to speculate or explain how a rigid body of various metals + plastics with a grid of synthetic string (or cat gut, i suppose) would deteriorate at altitude? perhaps someone from denver can tell us about their experience playing tennis at 5000ft+ ? is there a forum for these questions ...