Before the First World War, that is, more than a century ago, engineers conceived the notion of flying airfields, or flying vehicles capable of transporting other aircraft. Why did they become necessary? It all comes down to fighters’ restricted range on the one hand, and b̵o̵m̵b̵ers’ susceptibility to fighters on the other.
And what does its aviation power represent the F-22 and F-35 stealth fighters? As well as the Northrop Grumman B2 Spirit, a heavy low observable strategic b̶o̶m̶b̶er absolutely but the US may soon have flying aircraft carriers as well.