Originally Posted by
LondonElite
-- there is nothing stopping you from joining all three. Just make sure you don't have miles spread all over the place.
Good advice IMHO. I also am a member of all 3 (and Southwest too) but it is good advice not to have miles spread across all 3 unless you carefully monitor and don't let them expire. I also have a Credit Card for all 3 and although I concentrate spend, I do use all 3 even if only for the odd tank of Gasoline so that way miles do not expire. My 2 cents