Originally Posted by El_Duderito

Great overview. I'd probably separate them out into 'day of travel' benefits and general benefits (e.g. partner status cards, upgrade vouchers).
Here's another view on the whole thing where this separation makes sense: reciprocal honoring of 'super tier' benefits.
As BA GGL/CCR I already get some AA Concierge Key benefits. On the other hand I assume that the BA Concorde Team/Special Services, CCR lounge access or car transfers could be offered to for instane AA CK customers.
Providing some of these day of travel benefits (better lounges, personal assitants, car transfers, ...) are rather expensive to operate and are currently limited to the carriers own 'super tier' elites. These services could be offered to more customers to lower the relative cost.