Watch this one when you have 45 minutes. Best film online I could find. Touches everything, concept, building, testing, including getting it's metals thru Russia - in which is the reason why this plane was built - wow ! - to outrunning a missile from North Korea.....to...well, everything.

https://www.youtube.com/watch?v=KDgPXcydwow

Booming heads of state, hilarious!
Miss the sonic booms, although they would scare the crap out of you at times

Absolutely. I can't imagine the amount of engineering paper and pencil lead that went into it.