JBU have evidently filed for a 2x BOS-STN & a daily BOS-LGW service commencing third quarter 2021.
Interestingly the applications reveal that the A321LR`s will be premium heavy with just 138 seats making them the lowest seating in any commercial A320 family operation.
One analysis indicates STN is a stop gap as the requested slots were offered & that JBU requires to set plans to start but may settle for 3x LGW in the medium term with the aim of all LHR eventually.
Only time/slot distribution/availability together with how STN & LGW fare & JBU will tell.
But a bird in the hand....