Originally Posted by bp888
OK, so the next 'Duh' questions are: why are they called 1P and 2P? And why 1K not 100K when K usually represents Kilo which is 1000, i.e. 1 Kg = 1000 g.

'And why 1K not 100K'
1Ks are routinely referred to by UA internally and on some of our our accounts etc as And "100K Premier Executive" or "100K Flyer" - the latter IIRC is the wording on pax manifest.