Three days after each roster comes out, I usually find I have a whole lot of new friends who want my jump seat, often accompanied by very convivial Groupwise messages that include the word 'mate' etc.
Many of these applicants are commuters. A subset of these are 'passengers' in the industrial sense of the word, as non-members of the HKAOA they are riding on the backs of those who are paying the dues and at least attempting to protect our contract.
My policy is that non-HKAOA jumpseat applicants should be given lower priority for jump seats, as what they save by not paying dues can be spent on the appropropriate full fare ticket. Fair enough?