WATABENCH,
You will know more about this than me but the booking pattern for the First Choice (now TOM) transatlantic charters seems to have run an odd course.
A check with the press release archive on the BRS website shows that the new First Choice programme (as it was then) was announced on 11 April 2006 with flights to commence in May 2007 for that summer season. The destinations were to be Sanford (weekly) and Puerto Plata and Varadero both fortnightly.
Then later in 2006 it was announced that forward bookings were so good that the commencement dates for the Sanford and Puerto Plata routes would be brought forward to February 2007, which is what happened, and Varadero commenced in May as originally planned.
The winter of 2007/2008 saw the Sanford and Puerto Plata services re-commencing in February 2008 after a break from the end of October 2007.
By this summer (08) the Puerto Plata and Varadero routes had been axed to be replaced by Cancun, in tandem with the faithful Sanford, but no routes have been carried on into the current winter.
I believe next summer will see the return of Cancun and Sanford.