A supersonic trainer that first flew in 1959 and is still teaching fighter pilots. Live T-38 Talon positions.
The T-38 is the step between the T-6 and a fighter, and it has been that step for over sixty years. More than 1,100 were built, the last in 1972, and the survivors have been rebuilt so many times that the type is effectively on its third life.
It is one of the more numerous types on the feed for the same reason the T-6 is: training bases fly it hard and fly it often. Formation sorties are common, so T-38s frequently appear on the globe in pairs or fours holding the same heading and altitude a few seconds apart.
NASA flies a fleet of them as astronaut proficiency trainers, which is why a T-38 sometimes turns up somewhere no air force base explains. Replacement by the Boeing T-7A Red Hawk has begun but will take most of the next decade.
The design first flew in 1959 and production ended in 1972, so every airframe flying is at least fifty years old. They have been repeatedly re-winged and rewired, and the T-38C has an entirely modern cockpit inside a 1960s shell.
Yes — it was the first supersonic trainer, and it is still capable of about Mach 1.3. Training sorties rarely need that, so what you see on the feed is usually subsonic.
The Boeing T-7A Red Hawk. Deliveries have slipped repeatedly, and the T-38 is expected to keep flying into the 2030s alongside it.