British Airways ethnic liveries was used on Concorde only. By 1999, BA had repainted around 170 aircraft in its new colours but then Chief Executive, Bob Ayling, announced a review of this process. The aircraft already repainted would keep the new designs, but the remainder of the fleet (still showing the pre-1997 union flag design) would receive a variant of Concorde's Union Flag design. The announcement was timed to divert some attention from Virgin's relaunch. A single 747-400 leased from British Airways to Qantas in 2000, registered as VH-NLH whilst operating in Australia, wore a hybrid livery complete with the Denmark "Wings" tail design.
Fish fin another fin. In particular, the fins immediately upstream of the caudal (tail) fin may be proximate fins that can directly affect the flow dynamics at the caudal fin. In 2011, researchers using volumetric imaging techniques were able to generate "the first instantaneous three-dimensional views of wake structures as they are produced by freely swimming fishes". They found that "continuous tail beats resulted in the formation of a linked chain of vortex rings" and that "the dorsal and anal fin wakes are rapidly entrained by the caudal fin wake, approximately within the timeframe of a subsequent tail beat". Once motion has