Is an airport transfer from Nha Trang 6 hours before departure necessary, and is airport fast track worth buying?

A traveler reported that a travel-agency representative linked the organized transfer schedule to the agency’s responsibility for getting package guests to their flight when transfers are included. This was a reported assurance, not verified evidence that delays cannot occur.

Fast track was offered at USD 67 per person on an Anex package. The traveler had also seen reports of a USD 25 option available locally and planned to decide based on conditions, but did not provide firsthand confirmation of that price.

One traveler reported that their Anex transfer was scheduled 6 hours before departure and wanted to leave independently later. The discussion provides no confirmed later departure time and no check-in or boarding cutoff that would justify doing so.