337 Reno Tahoe International Airport - Airport Police Main
338 Reno Tahoe International Airport - Airport Police Secondary
339 Reno Tahoe International Airport - Airport Security Specialists
449 Reno Tahoe International Airport Fire Main
450 Reno Tahoe International Airport Fire Secondary
451 Reno Tahoe International Airport Fire Tac 1
452 Reno Tahoe International Airport Fire Tac 2
1809 Reno Tahoe International Airport - Operations 1
1811 Reno Tahoe International Airport - Maintenance 1
1812 Reno Tahoe International Airport - Building Services
1813 Reno Tahoe International Airport - Building Maintenance
1814 Reno Tahoe International Airport - Airfield Maintenance
1816 Reno Tahoe International Airport - Airport Parking
1817 Reno Tahoe International Airport - Stead Airfield
1818 Reno Tahoe International Airport - Tac 1
1819 Reno Tahoe International Airport - Tac 2
There is no talkgroup 1815 at the airport.
Also keep this in mind - there are several radio profiles used at the airport - if you hear someone say for instance go to channel 4 - channel 4 could be one thing on one radio profile and something entirely else on another radio profile - in other words the talkgroups are the same but on one radio OPS1 talkgroup could be on channel 1 (Operations Dept radios) and on another radio (Maintenance Radios) it might be on channel 10.
Those would be on individual airline company frequencies - only one I know off hand is unconfirmed for Delta/Skywest and that is 131.4 (that is an ARINC assigned freq and is AM mode)