[Baz]

For the Artemis I mission, four veteran engines were selected, with a combined 25 flights between them, according to NASA:

Engine E2045: The most veteran engine with 12 flights, including a docking with Mir in 1998 and John Glenn's flight, also in 1998
Engine E2056: Four flights, including STS-109, a Hubble Telescope servicing trip and Columbia’s last successful mission
Engine E2058: Six flights, all to build the space station
Engine E2060: Three flights, most notably STS-135 Atlantis, the final shuttle mission