Romania is a model for training Ukraine's pilots to fly F-16s. The Ukrainian Air Force has withstood six months of war against a much larger and more sophisticated Russian force, but U.S. lawmakers worry Russia could gain air superiority as the war grinds on unless Ukrainian pilots are equipped and trained to fly modern Western aircraft, such as the F-16.  Romania, a NATO member, offers a case study for how this could go. Its Air Force is completing a transition from Soviet-era MIG-21s to U.S. built F-16s, providing a model for training pilots for the switch, according to U.S. Airmen involved with the training. The U.S. Air Force's Air Education and Training Command even has a course for partner and ally nation pilots that could be tailored for Ukraine.