ClsArsp

Class B/C/D/E airspace and airspace hours data for terminal communication facilities, derived from the legacy TWR8 record in TWR.txt

Source: NASRTable: CLS_ARSPVersion: e25086c3e952 (effective 2026-04-16)

Unique record key is SITE_NO + SITE_TYPE_CODE. Ordered by SITE_NO, SITE_TYPE_CODE. Data is comparable to legacy TWR8 record but may be organized differently.

Example query

# Introspect the ClsArsp type in GraphiQL at https://api.nav.sortie.co/graphql
# Example shape (pair with a compatible root query field):
{
  # ...rootQuery... {
    effDate
    siteNo
    siteTypeCode
    stateCode
  # }
}

Run at https://api.nav.sortie.co/graphql — GraphiQL is available in-browser.

Fields (13)

Field	Type	Description	Enum
effDate ← EFF_DATE	String	The 28-day NASR subscription effective date in format YYYY/MM/DD
siteNo ← SITE_NO	String	Landing facility site number; a unique identifying number. Also serves as part of the composite unique record key along with SITE_TYPE_CODE
siteTypeCode ← SITE_TYPE_CODE	SiteTypeCode	Facility type code indicating the type of landing facility	A — Airport H — Heliport B — Balloonport C — Seaplane Base G — Gliderport U — Ultralight
stateCode ← STATE_CODE	ClsArspStateCode	Associated state post office code; standard two-letter abbreviation for US states and territories	56 values AK — Alaska AL — Alabama AR — Arkansas AZ — Arizona CA — California CO — Colorado CT — Connecticut DC — District of Columbia DE — Delaware FL — Florida GA — Georgia GU — Guam HI — Hawaii IA — Iowa ID — Idaho IL — Illinois IN — Indiana KS — Kansas KY — Kentucky LA — Louisiana MA — Massachusetts MD — Maryland ME — Maine MI — Michigan MN — Minnesota MO — Missouri MP — Northern Mariana Islands MS — Mississippi MT — Montana NC — North Carolina ND — North Dakota NE — Nebraska NH — New Hampshire NJ — New Jersey NM — New Mexico NV — Nevada NY — New York OH — Ohio OK — Oklahoma OR — Oregon PA — Pennsylvania PR — Puerto Rico QM — Marshall Islands (or other Pacific territories) RI — Rhode Island SC — South Carolina SD — South Dakota TN — Tennessee TX — Texas UT — Utah VA — Virginia VI — U.S. Virgin Islands VT — Vermont WA — Washington WI — Wisconsin WV — West Virginia WY — Wyoming
arptId ← ARPT_ID	String	Location identifier; unique 3-4 character alphanumeric identifier assigned to the landing facility
city ← CITY	String	Airport associated city name
countryCode ← COUNTRY_CODE	ClsArspCountryCode	Country post office code for the country in which the airport is located	7 values AI — Anguilla AN — Netherlands Antilles BM — Bermuda BS — Bahamas TC — Turks and Caicos Islands US — United States VG — British Virgin Islands
classBAirspace ← CLASS_B_AIRSPACE	TurnDirectionValid	Indicates the terminal communication facility contains Class B airspace; designated with Y, else null	Y — Facility contains Class B Airspace
classCAirspace ← CLASS_C_AIRSPACE	TurnDirectionValid	Indicates the terminal communication facility contains Class C airspace; designated with Y, else null	Y — Facility contains Class C Airspace
classDAirspace ← CLASS_D_AIRSPACE	TurnDirectionValid	Indicates the terminal communication facility contains Class D airspace; designated with Y, else null	Y — Facility contains Class D Airspace
classEAirspace ← CLASS_E_AIRSPACE	TurnDirectionValid	Indicates the terminal communication facility contains Class E airspace; designated with Y, else null	Y — Facility contains Class E Airspace
airspaceHrs ← AIRSPACE_HRS	String	Hours of operation for the airspace of the terminal communication facility
remark ← REMARK	Remark	Remark associated with the class airspace record, referencing the field to which the remark applies in parentheses	(AIRSPACE_HRS) CLASS E AIRSPACE OTR HR. — Remark on airspace hours: Class E airspace other hours (CLASS_B_AIRSPACE) EXPECT TO LEAVE AND RE-ENTER CLASS B ASP DURG MOD TO HVY ARR PDS. — Abbreviated remark: Expect to leave and re-enter Class B airspace during moderate to heavy arrival periods (CLASS_B_AIRSPACE) EXPECT TO LEAVE AND RE-ENTER THE CLASS B AIRSPACE DURING MODERATE TO HEAVY ARRIVAL PERIODS. — Full remark: Expect to leave and re-enter the Class B airspace during moderate to heavy arrival periods