Fuel inlet for Northrop F-5

I had never seen one of these up close and I imagined them to be massive. My dad was a in-flight refueler during Vietnam and I was impressed by how it was done. Until I saw the actual inlet and imagined them being 30k feet in the air AND traveling at multiple hundreds of hour at the time, I am in awe.

See it here: http://flic.kr/p/oWz8yL