UAX on DH are PS0X but names don't show up in employeeRes on the passrider list. Much like UAL employees as soon as crew scheduling builds a segment with a DH, the automatic engine creates the PNR and books a seat under a placeholder name. The actual crew names show up maybe 24-36 hours before the flight. There may be a flight showing a number of PS riders but when you view the list, any names that don't show up are probably UAX crew. PS0X is still must ride but goes on the upgrade list below all other PS (even below PS5, etc...) and PS0X also = Group 3 for boarding.