Dear HD,
I can see how you came up with that however please consider this...
h. A ULR crew will normally comprise of 2 Captains and 2 First Officers but may be revised to 1 Captain and 3 First Officers subject to the approval of DSVP-FO.
At no point does it say a normal crew is 3.
The g statement backs up and repeats the contingency provision rule.
There is no discretion on ULR's, its up to 22hrs duty.
So if as you say, a 3 crew ULR can be planned then FDP for 3 crew ULR is still 22hrs! (With the initial flt planned at <15hrs) Is any authority really going to allow a planned FDP of up to 22hrs for 3 crew???
JFK and IAD are ULR's as defined by EK as block is >14hrs during the year.
As Fatbus says BOS is not by EK definition a ULR, however is it being operated as a ULR currently. See trip info.
If they are to operate BOS as a 3 crew it should be under normal FTL's for all year. City pair rules.
They can't say the flight time is less in the summer as the block as published is the same for APR and MAY.
APR (4 crew) 13:30 and MAY (3 Crew) 13:30
M