Had a look through the Gatwick Long Haul schedule of which there are 12 weekly flights, 6x weekly to New York, 4x weekly to Los Angeles and 1x weekly each to Fort Lauderdale and Orlando. The Fort Lauderdale route is a reduction from Summer 14, with the slot given to Orlando on a Saturday. It leaves 2 gaps in the timetable, giving each aircraft a break in the schedule. Number at end designates aircraft.
Have had confirmed from airline that Oakland was on the list of options, but decided not to operate, so looks like this could be the final schedule for next summer.
Mon LGW - JFK 1800/2100 JFK - LGW 2230/1030+ 1
Mon LGW - LAX 1345/1705 LAX - LGW 1905/1335+ 2
Tue LGW - JFK 1800/2100 JFK - LGW 2230/1030+ 2
Tue LGW - FLL 1550/2000 FLL - LGW 2200/1115+ 1
Wed LGW - JFK 1800/2100 JFK - LGW 2230/1030+ 1
Wed LGW - LAX 1345/1705 LAX - LGW 1905/1335+ 2
Thu LGW - JFK 1800/2100 JFK - LGW 2230/1030+ 2
Thu LGW - LAX 1345/1705 LAX - LGW 1905/1335+ 1
Fri LGW - JFK 1800/2100 JFK - LGW 2230/1030+ 2
Sat LGW - JFK 1800/2100 JFK - LGW 2230/1030+ 1
Sat LGW - MCO 1550/2000 MCO - LGW 2200/1115+ 2
Sun LGW - LAX 1345/1705 LAX - LGW 1905/1335+ 1