There are travel agents who are experienced with this and do this frequently in most cities. This is something that is extremely detailed and involves large quantities of people with questions, unfamiliarity with flying, documentation, etc. If it was me, I would have a travel agent do all of the heavy lifting on this and field all of the questions, problems, etc. We all "fly alot" on this board, but finding air transportation and managing the logistics and process for this is much more involved than simply contacting a few airlines to compare prices.