The "scam" to which you refer here out of context relates to the use of undated receipts in the new In-Flight Cafe bags. Many employers require receipts for reimbursement of per diem meal expenses. If an employee forgets or loses a receipt, they are out of luck and money. So, many employees for these companies keep a reservoir of undated receipts.
Is this totally ethical? Probably not. But it is a response to employers that do not trust their employees or who make onerous demands on them. I own two businesses and my employees get to keep what they don''t spend when traveling. They can eat Cheesesteaks for dinner or go to Le Bec Fin. The only exception is when they entertain clients at meals. I pick-up the whole tab and the employee keeps the per diem as a "thanks" for their extra time and effort.
What about customers "scamming" US Airways? It happens. But your loyal passengers basically work within the rules made by the airline. Rather than asking about PineyBob and "scams", please direct folks to the threads that have evolved into discussions of physicians providing emergency medical care on flights (I have seen two episodes already this year). There are also cases where passengers have informed the company of internal safeguards that have failed, costing significant amounts of money.
On the whole, I think the original post was misleading, at best.