Ground services :THAI Royal Silk or Royal Orchid lounges are available to THAI's premium passengers in various domestic and international destinations. The airline's hub at Suvarnabhumi Airport also includes a Royal First Class Lounge for first class passengers. Passengers traveling internationally from Bangkok in Royal Silk or Royal First classes are also entitled private security screening and passport control facilities, as well as free spa services at the Royal Orchid Spa, with different services available depending on the service class flown by the passenger. These services are not available to non-premium class passengers. THAI's first class ground services at Bangkok additionally provide private transportation services within the terminal to first class passengers.
On 30 September 2008, THAI's Ground services Department received a Certificate ISO 14001 from Bureau Veritas Certification[36]
Since 4 January 2011, THAI has been providing check-in services at the Bangkok City Air Terminal at Makkasan Station. Train services are provided by the Suvarnabhumi Airport Link.