There are regulations...
There are regulations restricting the height of the tall ships that are allowed to be there. Ostensibly, the takeoff charts, tailored for such
an occurrence, are based on this maximum allowed figure.
Thus, most carriers have two sets of charts for this....in this case, for Boston runway 22R, etc.....one set showing max takeoff weight for no ships, one set of charts for the 'tall ship'.....assuming its height is the max allowable. (If the particular ship is less than the max, so much the better.)
Again, it's up to management to provide its workers with the proper tools to do their jobs.
Fly safe,
PantLoad