I'm sure you realize this, but some might not: a 747-8 in 2017 is very different from a 747-100 in the 1960s https://en.wikipedia.org/wiki/Boeing_747#Specifica

I'm sure you realize this, but some might not: a 747-8 in 2017 is very different from a 747-100 in the 1960s https://en.wikipedia.org/wiki/Boeing_747#Specifications https://en.wikipedia.org/wiki/Boeing_747#Specifications