Sustainable tourism
Sustainability Rating
Surface sector
Surcharge (Q)
Sub-journey
Stuffer
Stopover charge
Stopover
Standby
Standard room
SSR – Special Service Request
Spouse fare
Split ticket(ing)
Spend Visibility
Special needs
Space available
SOTO Tickets
SOS – Scope of Services
SOP – Standard Operating Procedure
Soft opening
Slots
SLA – Service Level Agreement
Single
Sightseeing tour