Can I add an extra bag or a meal for my customer after I have already issued their ticket?

Yes, in many cases you can, but it depends on the airline and the supplier the ticket was booked through. Some airlines let you add extra bags, seats and meals after ticketing through the same connection you used to book, and where that is supported the software shows you what is available and what it will cost before you confirm. Others sell those extras only at the time of booking, or only on their own website and at the airport, and no API can change that.

The honest position is that extras after ticketing are one of the less consistent parts of flight content. Full service airlines and low cost airlines handle them very differently, and two airlines on the same connection can behave in opposite ways. Treat it as something you check on each booking rather than a feature you can count on every time.

Where an extra can be added, the charge is normally collected the same way as the original booking, and the new bag or meal is written into the booking record so it shows on the documents you send your customer. Where it cannot, your options are to send the customer to the airline directly or let them pay at the airport, which is usually dearer for them and leaves you out of the loop.

A sensible next step is to list the airlines your customers fly most often and ask us to confirm which of those allow extras to be added after ticketing on your setup, and in the meantime have your staff offer bags and meals at the point of sale, while you know for certain the option is there.