Tioman travelers who are taking the air plane to Tioman or back to the mainland, can reserve one-way ferry tickets by filling in the date for the required ferry trip, whether it's the Tioman-bound leg or the Mersing-bound leg. The other date can simply be left blank.
The rest of the reservation process is as usual, i.e. just fill in your preferred ferry time and the number of one-way tickets required. You'll be dispatched one-way tickets, delivered to the address that you've included in your reservation details.
By all means let us know if you have any questions.