Doesn’t matter. The 50 seat jet produces a 50 seat paycheck. They made the money on the Hong Kong flight, not yours. They can get any regional to bring that connection, you’re nothing special. 50 seat pay for 50 seat flying. Want more? Go fly a bigger plane (except at Envoy, there a 12 yr 44 seat CA can make more than a 12 yr 76 seat CA.... another concession for management to save training cycles.

You’re also dealing with AA thought process. They pull the 767 out of BOS where it ran a profitable BOS-CDG route. Instead they fly them in a 737 from BOS to JFK to catch a CDG flight. Problem is they still have to compete with everybody doing BOS-CDG direct. So, the 737 flight becomes free costing AA big money. So, instead of competing they dump more routes.
JetBlue is now about to start NAT flying. Both United and Delta are planning to increase BOS flying... while AA continues to shrink BOS.
Most mismanaged airline since Eastern.