From my experience, we usually get direct SBJ when departing out over the west gates from EWR, and are usually climbing through 8000'-9000' ish when we get there. As far as arrivals go, the downwind is flown at 6000' for 22L/4R arrivals. The only time i could imagine us flying at 3000' in the vicinity of SBJ would be on vectors for 11 coming off the PHLBO arrival. Typically, the vector will take you just east of Somerset airport, followed by a turn to the northeast to join the final just to the east-southeast of Morristown (MMU). All of this is perfectly legal because the class B doesn't start till about 7-10 miles east of SBJ and starts at 3000, so technically we never actually operate underneath the class B. I'm thinking (just a guess) the reason we get vectored so low around there is to stay below the downwind traffic for 22L/4R, as well as below the traffic going into TEB which has the JAIKE arrival routed directly over SBJ at 4000'. So with 22L/4R downwind traffic at 6000', TEB arrivals at 4000', and no way for 11 arrivals to stay at 5000' without having to descend through the TEB arrivals, it seems like 3000' is the only solution for 11 arrivals to be at in the vicinity of SBJ. Hope this helps...
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