If you are flying on a Thomas Cook or Thomson flight to the Caribbean, seats are allocated at the airport during the check-in process.
On many occasions, we are able to provide you with your flight locater reference and dependent on the rules of that particular airline, you may be able to choose your seat.
If you are flying with BA for example, you are often able to take advantage of online check-in and allocate your seat within 24 hours of the flight.
In some cases, the cruise line block book seats on an aircraft. Where this is the case, you will not be able to check in online or take advantage of seat selection.