Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.While the Virgin group of airlines; Virgin Atlantic, Virgin America, V Australia, and Virgin Blue, are owned by different entities (with the common denominator being Richard Branson), they have a tight marketing alliance.Virgin Atlantic just announced a promotion allowing their Flying Club members to earn double miles when they fly any of their other partner airlines. Register here and fly by May 31, 2011. Click here for a list of standard earning ratios so you can see whether it makes sense to bank your next flight to Flying Club.Members must register for this offer at www.virginatlantic.com/virginairlinesdouble to qualify for the double miles incentive.Offer valid across Virgin America, V Australia and Virgin Blue only.Offer valid only on bookings and travel completed between 1 March 2011 - 31 May 2011.Double miles will be awarded based on distance flown and in relation to the standard percentage offering given by your chosen airline and cabin class. Tier point earning will not be doubled.Offer valid across all regions and in all eligible classes. Eligible classes are as follows:Virgin America:Main Cabin: S, L, M, U, E, H, B, VMain Cabin Refundable: YMain Cabin Select Instant Upgrade: Z, QMain Cabin Select: O, WFirst Class: I, D, C, JV Australia:Promotional Economy Class: V, Q, ADiscounted Economy Class: K, G, E, L, N, TFull Economy Class: Y, B, HPremium Economy: W, S, R, OBusiness Deal: I, DBusiness Flexi: J, CVirgin Blue:Promotional Economy Class: R, V, XDiscounted Economy Class: A, B, C, E, G, H, J, K, M, P, Q, S, T, UFull Economy Class: N, YPremium Economy: O, W[card card-name=‘Virgin America Visa® Signature Card’ card-id=‘22086217’ type=‘javascript’ bullet-id=‘1’]