USAIR is not a major international carrier which is obvious. They make their money by operating small aircraft on short haul routes. That is why on their international routes they only operate the 767 while other carriers fly the same route with 747s or even 777s. Most Europen carriers do operate larger aircraft than U.S. carriers. Look at the Atlantic. No American carrier operates the 747-400 over the Atlantic while British Airways, Virgin Atlantic Airways, KLM, SAA, PIA, and Air France all operate the 747-400 over the Atlantic. Most of the Atlantic flights flown by the U.S. carriers are flown by 767 and 777 twins while European carriers operate them with the four engined 747-400 and early variants.
"History does not long entrust the care of freedom to the weak or timid." D. Eisenhower