The two European fighters are generally seen as aerodynamically superior, having outperformed both US-made aircraft in tests under the adverse climatic conditions in which they might have to be used, particularly in the high altitudes and low temperatures of northern Kashmir. Experts suggest that the American planes are technologically ten years behind the European ones, and it doesn’t help that Pakistan, India’s likely adversary if the aircraft were ever pressed into combat, has long been a regular US client for warplanes.