First decide: agent or principal
If you arrange a supply between a customer and an airline or hotel, and the contract is between them, you are acting as an agent. Your income is the commission or service fee, and that fee is your supply. If you buy hotel rooms, transfers and tours in your own name and resell them as a bundle at your own price, you are the principal and the whole package price is your supply.
This choice drives revenue too. An agent reports AED 600 of commission on a AED 8,000 booking; a principal reports AED 8,000 of revenue and AED 7,400 of cost. Our view: document the position in your supplier contracts and booking terms, because the FTA will look at the paperwork, not at what you call yourself.