Scope of work determines who can fly with JetBlue painted on the side of the airplane. For instance, at Delta RJs are limited to 76 seats if they are a CRJ 700 or E170. And there’s also a total limit on the number of “large” regional jets. There may be a limit on the number of small CRJs too, but I can’t remember.

Basically, with no scope section if the company wanted too they could hire SkyWest to fly A320s and paint JetBlue on the side of them with little bitty letters that say “Operated by SkyWest.”