Who goes first?
I was a pax departing Singapore and there were two lines of taxying heavies converging on an intersection, to reach the departing runway. It raised the question in my mind: How does the ATC decide who gets priority in a converging queue? Would it be booked slot time, size/climbing speed of aircraft, departure SID, first come first served? Or a combination? I assume there is a procedure, not just at the whim of the controller? Quite a complicated decision if all factors are taken into account, and has to be reviewed for each pair as they reach the merge.
And I guess every pilot feels he/she should go first?
Thanks!