McDonnell Douglas A-4F <i>Skyhawk</i>s of the U.S. Navy flight demonstration team <i>Blue Angels</i> flying in delta formation.
<a rel="nofollow" class="external autonumber" href="http://www.airandspacemagazine.com/ASM/Mag/Supp/JJ04/a4ba.html">[1]</a> (broken link)