I was watching a NG documentary recently. It discussed the whole commercial airlines industry is operating under stress at the moment.

Catering, IT, scheduling, ATC, operation dispatch and aircraft maintenance.

Shortage of planes has added pressure on getting spare parts to keep the planes flying more frequency than usual. Airlines just don’t have spare aircrafts for contingency.

Taking out a 763 permanently likely will cause ripple effects in the schedule. I am sure this 763 would be flying a number of long haul international flights in additional to the domestic hub-to-hub flights.