...totally agree with Ennie, a smile, a polite greeting and some friendly banter with the Transfer Counter at Changi last month earned me an unexpected upgrade to Upper Deck Business Class on the next leg of my journey... without asking for one... and, it had nothing to do with my occupation, no mention made of that... and I'm the lowest Frequent Flyer category, so it couldn't be that either... just a tired passenger who managed a smile for the airport staff after two days of sitting in pressurised cabins with little or no sleep and a four hour job interview in transit the day before...
The upgrade was gratefully received and appreciated... a big thank you to the airport staff and the airline...