Crotalus
As we both probably know who Cpt of said MYT probably was, I'm with Scottish on this one! He gets a superb service outta both us and them 99.9% of the time but at this time of the year it takes very little to throw him over the edge, though its usually with me!!
Flexability is the name of the game here but sometimes circumstances do not permit every direct routing. The bigger picture is not always available cause contrary to popular belief, TCAS only works when everyone has serviceable transponders!