Just filling out the Airport's Business Users' survey, and there's an interesting question on membership of loyalty programmes. All the usuals plus a few notables:
* Spanair
* Germanwings (LH's LCC outfit...)
* SWISS (incorrectly lacking capitals on the survey)
* Lufthansa
* American Airlines
* United Airlines
* Virgin Atlantic
* Wizz Air (Polish LCC)
Interesting that they left bmi's Diamond Club off the list - that's the travellers' favourite at the moment, for as long as it lasts.
There's also a question on how FFPs make us feel valued by airlines, with a prompt to give as much detail as possible.