I have always wondered how the Lifetime Gold Membership is calculated on UAL. I travel quite a bit, mainly transatlantic trips. I have been a Gold/Platinum with United for at least 10 years, but those Lifetime Miles never seem to increase. Well, actually, they do, but very, very slowly. Does anyone know how these miles are calculated. Is it based on actual miles vs. fare class? I have searched high and low on UAL site to figure out how they calculate these miles, but it must be all one big secret because I have found absolutely zilch!