AA has a large hub in LHR with British Airways...it's essentially another JFK. JetBlue as of now won't offer connections to Europe and beyond so it's not like they can offer something we cannot. Except blue colored chips.

Their mint product is nice but keep in mind we compete directly with them in the JFK-LAX and now BOS-LAX transcon market using the 321T and it has done well. I'm cautiously optimistic their entry will not be very successful.