“The aircraft flew in circles for HALF AN HOUR burning down a full load of fuel “
Dump8ng fuel.
Burning or dumping ... either way, the important point is a half hour of sustained flight ... too heavy to land ... on one engine.
Engine maintenance ... I just learned that GE (and probably the others) will send a team to the customer’s site for routine maintenance. Thank you.
In any case, my point stands. Boeing built a great aircraft.