Reasons why ATC can't auto-transfer or transfer with T/O clearance:
Mixed mode operations;
Closely spaced parallel arrivals;
Closely spaced parallel departures;
Precluded in local instructions.
Reasons for early frequency change:
To enable continuous climb/low SID altitude limit;
To allow a turn on course as soon as possible/after noise;
Things that pi$$ off ATC:
Aircraft leaving the frequency without being given a change;
As above and guessing the wrong frequency;
testpanel
As a Tower controller I will give you a frequency change when it suits me and you can call departure when it suits you. If you level off or go 10 miles in the wrong direction (vectored SIDs), so be it.
nick14
There are times when we have to talk to you early in a missed approach: traffic information and separation from other traffic. If I don't need to talk to you, I won't. Some controllers just love to talk though.
Flip this around for a second: call tower before you get to 2 miles final especially on a mixed mode runway.
