Police services provided by the Houston Police Department.  
Fire/Rescue/EMS services provided by the Houston Fire Department.

For airport operations, see Harris County Regional Radio System (HCRRS) Trunked Radio System.

Atlantic Southeast Airlines ("Candler") doing business as Delta Connection.
Chautauqua Airlines doing business as Continental Express, Delta Connection and United Express.
Colgan Air doing business as Continental Connection.
Comair doing business as Delta Connection.
ExpressJet Airlines ("Jet Link") doing business as Continental Express.
PSA Airlines doing business as US Airways Express.
World Airways doing business as Sonair.

Continental Airlines Ramp Control controls ramps for terminals A, B, C, D and E. 

Air Traffic Control:
Arriving Aircraft: TRACON > Tower > Ground > Ramp Control
Departing Aircraft: Ramp Control > Clearance Delivery > Ground > Tower > TRACON
Houston Terminal Radar Approach Control (TRACON)
124.05   S [ CSQ ] Automatic Terminal Information Service (ATIS)
128.1    S [ CSQ ] Clearance Delivery
122.4    S [ CSQ ] Flight Service Station (FSS)
119.95   S [ CSQ ] Ground
121.7    S [ CSQ ] Ground - East
118.575  S [ CSQ ] Ground - West
120.725  S [ CSQ ] Tower - Runway 8L/26R
125.35   S [ CSQ ] Tower - Runway 8R/26L
135.15   S [ CSQ ] Tower - Runway 9/27
127.3    S [ CSQ ] Tower - Runways 15L/33R and 15R/33L

Aviation - Airlines:
Air France is serviced by Atlantic Aviation.
Aviacsa, Emirates, Funjet Vacations and Sonair are serviced by Menzies Aviation.
129.75   S [ CSQ ] Aeroméxico
128.875  S [ CSQ ] Air Canada / Air Canada Jazz
130.175  S [ CSQ ] America West ("Cactus") - Dispatch/Maintenance
129.325  S [ CSQ ] American / American Eagle ("Eagle Flight")
130.475  S [ CSQ ] British Airways ("Speedbird")
129.925  S [ CSQ ] Continental - Deicing
130.9    S [ CSQ ] Continental - Load Planning
130.725  S [ CSQ ] Continental - Maintenance
129.3    S [ CSQ ] Continental - Operations
130.825  S [ CSQ ] Continental - Ramp Control - North (Terminals C and D)
131.275  S [ CSQ ] Continental - Ramp Control - South (Terminals C and E)
121.625  S [ CSQ ] Continental - Ramp Control - West (Terminals A and B)
128.925  S [ CSQ ] Continental Connection (Colgan Air) - Operations
136.675  S [ CSQ ] Continental Express (Chautauqua) - Operations
129.675  S [ CSQ ] Continental Express (ExpressJet) - Dispatch/Maintenance
131.825  S [ CSQ ] Continental Express (ExpressJet) - Maintenance
136.65   S [ CSQ ] Continental Express (ExpressJet) - Load Planning
136.55   S [ CSQ ] Continental Express (ExpressJet) - Operations
131.85   S [ CSQ ] Delta / Delta Connection - Dispatch/Maintenance
129.5    S [ CSQ ] Delta / Delta Connection - Operations (includes Miami Air International)
131.625  S [ CSQ ] DHL
131.15   S [ CSQ ] Emirates
131.925  S [ CSQ ] FedEx
130.65   S [ CSQ ] Frontier
131.25   S [ CSQ ] Northwest - Dispatch
130.1    S [ CSQ ] Northwest / KLM - Operations
129.4    S [ CSQ ] Southwest
130.55   S [ CSQ ] Taca
130.05   S [ CSQ ] Tradewinds
130.3    S [ CSQ ] United / United Express (includes Allegiant Air)
129.425  S [ CSQ ] UPS
130.0    S [ CSQ ] US Airways / US Airways Express (license canceled)

Aviation - ARINC En Route Service:
131.65   S [ CSQ ] South Central USA (available above 20,000 feet and on the ground at IAH)

Aviation - Corporate:
130.8    S [ CSQ ] ConocoPhillips
129.825  S [ CSQ ] Exxon Mobil
131.875  S [ CSQ ] Shell
131.725  S [ CSQ ] Tenneco

Aviation - Fixed Base Operators:
129.025  S [ CSQ ] Atlantic Aviation
131.6    S [ CSQ ] Landmark Aviation
130.6    S [ CSQ ] Menzies Aviation

Airline Ground Operations:
Most Continental Airlines operations are on a 900 MHz OpenSky trunked radio system.
460.775  R [127.3] Air France
460.675  R [114.8] American
464.475  R [ 82.5] British Airways "if need me holler on channel 1"
452.4625 R [d 125] Continental - Aircraft Lavatory and Water Service (AccuFleet)
461.225  R [d 072] Continental - Aircraft Exterior Cleaning? (dispatch, aircraft, soak, final service)
464.375  R [d 516] Continental - Aircraft Fueling (Allied Aviation Services)
461.7875 R [127.3] Continental - Aircraft Interior Cleaning (Servisair?)
460.75   R [127.3] Continental - Aircraft Maintenance
460.85   R [127.3] Continental - Aircraft Maintenance
460.7    R [127.3] Continental - Catering (Chelsea, Ch. 1)
461.325  R [127.3] Continental - Catering (Chelsea, Ch. 2)
463.425  R [127.3] Continental - Catering (Chelsea)
461.8875 R [MTRBO] Continental - Electric Carts/Wheelchairs (PrimeFlight Aviation Services)
460.9625 R [127.3] Continental - Ground Equipment Maintenance
464.05   R [127.3] Continental Express - Ramp Security
460.825  R [103.5] Delta
461.5625 R [d 311] Emirates
463.75   R [127.3] ExpressJet - Aircraft Maintenance
463.7375 R [d 071] ExpressJet - Aircraft Maintenance (was simulcast with 464.6375)
461.8125 M [d 411] ExpressJet - Unknown - pod 7, B65, B60-B66, pod 8, aircraft, in the food court, 62A, B83A
461.1125 M [     ] FedEx
466.1125 M [     ] FedEx?
462.3375 R [131.8] Frontier
464.775  R [d 343] KLM
460.825  R [156.7] Lufthansa?
463.3    R [d 343] Northwest
464.325  R [203.5] United
457.7125 M [d 612] UPS
461.1625 R [141.3] US Airways

Federal Government:
165.6875 R [100.0] Customs Inspectors
162.325  S [     ] Federal Aviation Administration - Data Bursts
169.3    M [ P25?] Transportation Security Administration (TSA)
172.15   R?[ P25 ] Transportation Security Administration (TSA)
172.9              key-up

Miscellaneous Airport Services:
464.7    M [203.5] Airport Concessions
463.3875 R [d 125] Atlantic Aviation
464.575  R [123.0] Consolidated Rental Car Facility - Shuttle
467.8125 M [ 85.4] Menzies Aviation
489.15   S [     ] TerminaLink Train Data
489.25   S [     ] TerminaLink? (morse)
492.15   S [     ] TerminaLink Train Data
492.25   S [ 67.0] TerminaLink? (open mic/keyed-up with dead air)
464.625  R [ 82.5] Wackenhut Security
152.3    S [ CSQ ] Yellow Cab - Staging (Base)

Parking Shuttles:
463.9    S [103.5] Air Park IAH
464.025  R [d 125] Allright Airport Parking
462.225  R [123.0] Ampco Express Airport Parking
452.15   R [d 114] Park N Fly
464.125  R [118.8] Parking Cents
463.575  R [233.6] Parking Spot
452.2    R [118.8] Service Park
453.0125 R [d 654] Xpress Park

Airport Hotel:
452.875  R [d 244] Houston Airport Marriott - Event Services (has phone patch)
461.0125 R [203.5] Houston Airport Marriott - Operations/Maintenance

Unidentified:
151.955  S [ 88.5] about 8 minutes, clear, 1xx unit
460.8    R [     ] ETA into gate 21
464.3    R [100.0] ?
464.55   M [d 412] Continental Cargo Handlers or Ramp Security? - aircraft 703 at D11 needs to be secured, jetway, tell them to go to terminal E, aircraft 18 cleaners haven't been on it yet, plane is on D5 (continental 777), aircraft 14 at gate C16 status, C16 secured call ops with times
464.6    R [136.5] Parking Shuttle - paul, pickup at oscar, unit 30
469.5375 I?[d    ] brief voice
932.7    S [     ] FAA? data

Obsolete (no longer used):
126.225  S [ CSQ ] Construction NOTAM Information
131.475  S [ CSQ ] Pakistan International
151.865  S [d 423] Atlantic Aviation (assumed obsolete)
460.725  R [d 627] Continental - Wheelchairs (Associated Building Services, Ch. 1) (assumed obsolete)
461.75   R [127.3] Continental - Aircraft Lavatory Maintenance
464.4375 R [d 244] Southwest
464.6    R [d 743] America West - Customer Service (assumed obsolete; US Airways repeater still in use)
464.6375 R [d 306] ExpressJet - Aircraft Maintenance (was simulcast with 463.7375)
464.675  R [d 114] Continental - Electric Carts (Associated Building Services, Ch. 2) (assumed obsolete)

Related Links:
AirNav
FAA Airport Diagram