I don't see B6 covering Chicago, STL, BNA, etc that Southwest is deleting from EWR.
It could probably increase BOS-EWR with three more round trips. For example, on Nov. 12, a 7am flight leaves BOS then a 10:28am flight is the next one. It could add a flight in between those two as it's a big gap.
On that day out of EWR, B6 has 7x daily on EWR-MCO, 5x on EWR-FLL, 2x daily on EWR-TPA. I didn't realize B6 had high frequency on EWR-MCO. AUS seems to be a larger B6 spoke than the typical B6 spoke. Maybe an increase on TPA-EWR and AUS-EWR (1x daily) could be added and it could be complementary with AUS-JFK. That would be great for passengers who will be losing the WN nonstop and it will provide United some competition.
What other routes could it offer?