What astronauts and/or pilots had their "own" T-38 for transportation and practice?
No pilot or astronaut has &quot;their own aircraft&quot;. Not in any unit I've ever seen.
Their name might be painted on the side of one, but they fly whatever the maintenance shop gives them for that day and mission.
Transportation? Sure. &quot;Major Snuffy has to go to Houston for some training on the FooBar hardware. Ralph, take him, and go back on Thursday to pick him up.&quot;
Of course, this counts towards flight hours, mission and route planning, etc, etc.
&quot;Borrow&quot; a jet&quot;? When I was stationed at Griffiss AFB NY in the late 70's, we sometimes had a pilot go for a weekend cross country. Leave Thursday or Friday afternoon, come back Sunday afternoon. Off to Frostbite Falls, MN Regional airport, to visit Mummy and Daddy for a couple of days. And we were loading golf clubs, skis, whatever, in the underwing travel pod.