According to the union newsletter, HKG base has about 300. pmUA hired them late 1990s/early 2000s. Some may have transferred from the US when UA/CO contracts merged. Some are US citizens/residents, some non-US HKers, some became HKers because of this job. HKG seems to be the only base with no flights to work at all in the past months. HK Gov has extended the foreigner ban until Sep 18, so SFO-HKG-SIN may or may not come back.