I can't really help you with that one.
All I know is that (according to BA AND AA)I spend £ 4,900 on the average trip and do approx. 88 trips a year with them (I have to commute on a weekly basis to the US and then stuff around Europe and US)
Therefore a total spend of £ 431,000 per annum.
This is mainly First Class transatlantic. But I am by no means on of the most Frequent Flyers in my company. So there must be quite a few people out there who are really notching up the miles.