Earlier today, .bomb was showing the same "not available" for today's #28 LAX-JFK (although as of this moment it won't show anything anyway due to proximity to departure). If today's #28 -- which arrives at JFK at 12:43a 5/28 -- is a non-p.s. 757, then your #837 tomorrow, as an early morning departure, could be the same aircraft. Perhaps there is and FT'er on #28 today that can confirm?