I think the idea is that ships etc. are called "she", but this is, of course, due to the English language. In Finnish there are no gender-related issues like this so I tend to think of ships etc. as just technocal marvels as they are.
However, I agree with the writers who say some planes appear female and some male -
Female: A330/A340, Concorde, B-1
Male: B777, B747, A320, B737, Tornado
Especially the Tornado almost reminds you of how some tools are purposefully shaped to look a bit like male genitals. Weapons (like pistols, assault rifles etc) have been designed to look the way they do since the 1930's with the intent to convey thoughts of strength, durability and lethality.