The meaning that if someone wants to use more than one ticket at a ticket, then you have already paid. To sell cheaper, does not have anything right now because I lost the ticket at airports in Thailand is very cheap.
Summarizing that if someone wants to use more than a ticket 1 leaves.And this ticket you have paid already. To sell at a cheaper, whatever are you alright? Make a loss, because now the ticket to fly in Thai, it is very cheap.