Tim Streater wrote in
:

On 22 Feb 2021 at 16:10:33 GMT, Peter Burke wrote:

Harry Bloomfield, Esq. wrote in
news:s10jpb$v3c$1 @dont-email.me:

What's the meaning of 'heavy', in United 328 heavy?

At a guess, just taken off and heavily laden with fuel.

No. It started when the 747 came in, to distinguish between smaller
airliners and the 500 seat jobs.

Thank you for clarifying, my bad guess.

Doubly bad as I have been known to say, "if you don't know, please don't
guess" . . .