Airports are distinctly odd. I am not referring to the fascination of departure signs hinting at a wide array of distant promises, and thousands of travellers anxious to get to who knows where, but to their tenants.To hear the airlines speak, it is impossible to squeeze a single dime in additional fare from their clients; these same clients who will spend with gusto as soon as they reach the airport. I am at Copenhagen airport as I write, and all around me are the top designer stores, Bvlgari, Hermes, Gucci and more all bursting at the seams!It is ironic, of course, that many airports make immense profits. The secretary general of IATA (tellingly a senior Alitalia executive) pointed out recently, that is an era that airlines were to loose a combined $10 billion, the world airports would turn a substantial profit from these very same airlines' clients! It is odd, and perhaps sustainable, perhaps not.In any event, it makes Richard Branson's decision to be a part of the new ownership of London's Gatwick airport appear very clever. If he can't losen up an additional $10 per ticket that the airlines need to thrive, he will sell them CDs, perfumes and bottles of gin.