From the FAQ on B6 Alpa:
Can JetBlue use an operator such as JetSuite to provide feed under a Capacity Purchase Agreement?
No, agreed upon language prevents the Company from doing this. The Company is prohibited from entering into any Capacity Purchase Agreements or purchase Block Space on other carriers, and they cannot not purchase equity in, or lend to, another company that is an air carrier or an affiliate of an air carrier as a means to circumvent the provisions of our Scope agreement. Other provisions in scope prohibit JetBlue for using an entity like JetSuites as an alter ego or for doublebreasting.
Can JetBlue operate a JetBlue Express / regional carrier?
JetBlue cannot enter into a Capacity Purchase Agreement with any other carrier. However, if JetBlue were to establish a new brand, i.e. JetBlue Express with regional jets, it would be flown by JetBlue Pilots under the same CBA and seniority list.
Seems fairly clear cut to me, no?