I've been encouraging my hip, elderly parents to join one of those airline senior clubs! They live in Berlin, Germany and usually fly whatever they feel like at the time (most mileage on UA/Lufthansa, BA, CO and AF), despite my urgings to choose a FF program and stick with it!

In your experience, what should I recommend to them? CO's Freedom Flight Club sounds interesting, as does UA's SilverWings. Most of their flights are between the Continent and the U.S. (SEA, NYC, DEN, LEX), and within Europe itself...
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"What do you mean you didn't get miles for that?!"