Having phone numbers for North America, Europe, Asia and Africa Central Managers is a major advantage when something isn't going right, like loosing your bags. Here is someone in BA who gets on the phone to someone senior enough to sort out the matter wherever you happen to be.
Of course having checked in you can request a premium services escort to take you straight to the Concorde Room, and then they will even go off and do your shopping whilst you sip Blue Monopole
! And you can phone to book in the Molten Brown spa in advance.
There are also no black out periods when it comes to using miles. If there is a seat available on the flight you can use miles to grab it, irrespective of whether the Trashco club card holders have already taken all miles seats.
Where a lounge has a conference room you can book it for free.
Guaranteed seat on any flight
35% discount with Hertz and Avis.
Upgrade at most hotels to the next room category
But it's the first in the list that really can be worth its weight in gold!