So.....
So it entered service just after the Me262 but.....
Sure it wasn't
"The Gloster Meteor can claim to be the first jet fighter to enter operational service, while No.616 squadron of the RAF was the first operational jet fighter in the work. The first fully operational Me 262 squadron, Kommando Nowotny, was not formed until September 1944, under the command of the famous ace Walter Nowotny, flying its first operation on 3 October."
Operational service my bad lol