Amanda Angelika wrote:

Well it was claimed they were constructed to withstand the impact of a
modern jetliner.

Are you talking about the true claim that the designers
expected them to withstand the impact from a Boeing 707,
or your false claim about a 747?

> The Boeing 747 which was designed in the mid to late 60s

came into commercial service in 1970. I understand The WTCs were not
completed until 4 years later 1974.

But the engineering design was done and construction began
in 1966.