"What factors impact getting an IFR release in NY's class B airspace from airports such as CDW and LDJ?" - Vince M.
“This is probably the most complicated piece of airspace in the world. Teterboro (TEB), Morristown (MMU), Caldwell (CDW) and Lindon (LDJ) all lay directly underneath Newark’s (EWR) arrival and departure procedures. Plus, all the approach procedures cross at the same altitude.
The FAA recognizes this interaction and complexity and actually publishes a diagram in the Airport Facility Directory. Look on page 357 of the Special Notices Section.
Another example of how complicated this airspace is to look at the Dalton departure. The FAA developed this hybrid departure procedure to accommodate the departures to the south out of Teterboro.
To really get an idea of how close these two airports are, the Initial Approach Fix (IAF) for Newark is on the ground at Teterboro. The Heavy jets are crossing TEB at 3, 000 descending on the glideslope. The Dalton calls for the departure to maintain VFR and make an immediate right turn and maintain below 1,500. Once clear of the Newark final, the IFR clearance becomes active.
An important factor to remember when operating in any of these congested areas is to provide plenty of time and fuel. The ground and airborne delays can eat into reserves. You also don’t want to be rushed in a busy area especially if you are operating single pilot. Slow down and double check everything. “