"thats because jets tend to have a higher max speed........."
Really? I never knew. I thought all planes flew at the same speed...
I should probably read up on that!
NB
Can you explain then why last week we had a PTL of 1400 when the original eta was 1315. Wx CAVOK and minimal traffic and both runways in use? Was it just a typo? We 'cheated' and departed accordingly to meet 'our' schedule and got direct tracking. To me the issuing of the PTL makes no sense because no-one adheres to them. Not ATC and not the pilots.