Well I disagree. The aviation industry is subject to constant change. I've personally seen my staff travel benefits watered down, my pension hammered, my retirement delayed by ten years and my productivity increased until the pips squeak in my time in BA. Not for the current generation of BA employees are the perks of APS, retirement at 55, 400 hours per year of flying with long slips in exotic places in genuinely first class hotels. So on that basis, it doesn't cut a great deal of ice with current employees when those from the golden era of BOAC/BEA complain that promises made to them decades ago are no longer being honoured. They'll find sympathy a little thin on the ground, just as they do when they write yet another letter to the BALPA Log complaining about the issue.
And if BA terminate my staff travel in retirement? Well I'll just have to suck it up like all the other detrimental changes we've all had to swallow.