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.
Fin strongly on fishes that it actually evolved a dorsal fin and tail in just the right place and with just the right hydrological design. These structures are all the more remarkable because they evolved from nothing — the ancestral terrestrial reptile had no hump on its back or blade on its tail to serve as a precursor." The biologist Stephen Jay Gould said the ichthyosaur was his favorite example of convergent evolution. The use of fins for the propulsion of aquatic animals can be remarkably effective. It has been calculated that some fish can achieve a propulsive efficiency greater than