KLM-it's very big in the UK market. BA Oneworld is one lousy program. KL offers elite bonus mileage (50-125%), free domestic US upgrades on NW and CO, lounge access even with Silver which is also valid in NW Clubs which their own members pay hundreds to use, ALL flights qualify for mileage, all tickets/routes qualify for upgrades not like COs ridiculous non-eligible upgrade fares, instant transatlantic upgrades available for 20000 miles at KLs lounges...
About Ryanair...just forget it!
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KLM PE,HHonors Diamond,SPG Plat,PC Plat,SAS Silver