m4j2t said:
how fast can we go when we here "best forward speed"
can we exceed 250 below 10K with authorization?
ATC cannot authorize you to deviate from the 250 kt rule. That's reserved for the Administrator's representative only, and we aint it. Pilots may deviate from the rule if safety requires a higher speed though. "Best Forward Speed" *should* mean, goes as fast as the regs and prudence allow. Generally, it will help if you reply by telling me what you can do, like "We'll give ya 290 kts" on climb out. Then I'll give the guy in trail 270, and the next guy behind 250. That's so we can give the Center their required in-trail spacing. (for example)
When I'm working the tower, I will try to NOT jam 3 departures going out the same gate right up each others tail pipes. However, on days like today, (sigh) we have to make the most of every hole we get. Plus TMU is giving us ONE minute departure slots to hit. (yeah, right) It would be nice if I could launch airplanes in a 4 ship flight some days....
When we're not that busy, and somebody in the tower keeps handing me three in a row out the same gate min spacing, I will say something unkind on the shout line.

It's also one reason the departure sequence is sometimes juggled a bit...