Kidding. Right?
How about ferrying the shuttle back to Florida after a California landing.
Yes I was. Just a little levity to break the monotony.
Well, you’re both right....
The first use of the 747 NASA transporter as part of the early flight testing was to take the Enterprise shuttle to altitude and release it so it could prove out the unpowered glide to landing portion of the shuttle recovery from orbit.
Most of that work was done in the mid 70’s and the 747(s) went on to serve as ferries as BG posted.
Got to help with the installation of ejection seats in the Enterprise before those tests started and the last time I saw Enterprise was in a Toyota commercial when they towed her off to a museum.
It’s for getting the Shuttle up to that new NASA CO2-saving Muslim-outreach very low earth orbit.