I would like to ask what do people in travel agencies often mean by "plus rebates", "rebates later", and "profits"?

"Add back" and "Post return" may have different meanings in different contexts. The following are possible explanations:

1. "Add back": the word May refer to adding some additional expenses to the travel itinerary, which are usually used to cover additional expenses during the trip or to provide better services.

2. "Return": This term may refer to the return of a portion of the cost after the trip, which may come from discounts from travel suppliers or cooperation with other agencies.

"Profit" in travel agencies usually refers to the economic benefits obtained by travel agencies after completing a trip. When a travel agency organizes a tour group, it will formulate a price based on the travel itinerary and budget, and include a certain amount of profit. This profit is necessary for travel agencies to maintain operations and provide services.