Alvin – sorry to doubt you but PPRuNe is littered with all sorts of ulterior motives unrelated to professional aviation.
You say you get some ID travel, that’s a start, but is that with the wide range of carriers that pilots employed by, say, major western airlines have access to? If not, and if you don’t have an interline department, can you get any assistance from a nearby ‘major’ airline’s interline office? Perhaps the national airline of the country in which you are working, or an airline with whom you already get IDs. Most seem to be ID90 subload, some ID50 confirmed, some business/first; there are also variations on eligible relatives etc. As you probably know, most interline schemes are based on reciprocity, so if your airline doesn’t give IDs, then you will have difficulty obtaining them for yourself.
Try Touchdown again at
www.touchdown.co.uk , try Lawsons at
www.lawsoninternational.com and Airline Employee Travel at
www.perx.com
Some hotels give crew discounts for leisure travel. In some cases they have a special central number for reservations, with others you have to negotiate with the individual hotel.
A few duty-free shops and shops in terminals give an airline discount and a few discos etc near airports grant discounted admission.
As you say, there’s nothing much written down (except that many major airlines have a staff travel booklet) and that’s probably just as well, otherwise it would only provide ammunition for the afore-mentioned journalists and taxmen! Good luck