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AIM 

6/17/21 

a location inside the U.S., its territories or 
possessions. 

g. 

Transit or transiting U.S. territorial airspace 

means any flight departing from a location outside of 
the U.S., its territories or possessions, which operates 
in U.S. territorial airspace en route to a location 
outside the U.S., its territories or possessions without 
landing at a destination in the U.S., its territories or 
possessions. 

h. 

Aeronautical facility

, for the purposes of this 

section, means a communications facility where 
flight plans or position reports are normally filed 
during flight operations. 

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4.  ADIZ Requirements 

a. 

To facilitate early identification of all aircraft in 

the vicinity of U.S. airspace boundaries, Air Defense 
Identification Zones (ADIZ) have been established. 
All aircraft must meet certain requirements to 
facilitate early identification when operating into, 
within, and across an ADIZ, as described in 
14 CFR 99. 

b. 

Requirements for aircraft operations are as 

follows: 

1.  Transponder Requirements.

 Unless other-

wise authorized by ATC, each aircraft conducting 
operations into, within, or across the contiguous U.S. 
ADIZ must be equipped with an operable radar 
beacon transponder having altitude reporting capa-
bility, and that transponder must be turned on and set 
to reply on the appropriate code or as assigned by 
ATC. (See 14 CFR 99.13, 

Transponder

On Require-

ments

, for additional information.) 

2.  Two

way Radio.

 In accordance with 

14 CFR 99.9, 

Radio Requirements

, any person 

operating in an ADIZ must maintain two

way radio 

communication with an appropriate aeronautical 
facility. For two

way radio communications failure, 

follow instructions contained in 14 CFR 99.9. 

3. 

Flight Plan.

 In accordance with 

14 CFR 99.11, 

Flight Plan Requirements

, and 

14 CFR 99.9, except as specified in subparagraph 
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4e, no person may operate an aircraft into, 

within, or from a departure point within an ADIZ, 
unless the person files, activates, and closes a flight 
plan with an appropriate aeronautical facility, or is 
otherwise authorized by air traffic control as follows: 

(a) 

Pilots must file an Instrument Flight Rules 

(IFR) flight plan or file a Defense Visual Flight Rules 
(DVFR) flight plan containing the time and point of 
ADIZ penetration; 

(b) 

The pilot must activate the DVFR flight 

plan with U.S. Flight Service and set the aircraft 
transponder to the assigned discrete beacon code 
prior to entering the ADIZ; 

(c) 

The IFR or DVFR aircraft must depart 

within 5 minutes of the estimated departure time 
contained in the flight plan, except for (d) below; 

(d) 

If the airport of departure within the 

Alaskan ADIZ has no facility for filing a flight plan, 
the flight plan must be filed immediately after takeoff 
or when within range of an appropriate aeronautical 
facility; 

(e) 

State aircraft (U.S. or foreign) planning to 

operate through an ADIZ should enter ICAO Code M 
in Item 8 of the flight plan to assist in identification 
of the aircraft as a state aircraft. 

c.  Position Reporting Before Penetration of 

ADIZ. 

In accordance with 14 CFR 99.15, 

Position Reports

before entering the ADIZ, the pilot must report to an 
appropriate aeronautical facility as follows: 

1.  IFR flights in controlled airspace.

 The pilot 

must maintain a continuous watch on the appropriate 
frequency and report the time and altitude of passing 
each designated reporting point or those reporting 
points specified or requested by ATC, except that 
while the aircraft is under radar control, only the 
passing of those reporting points specifically 
requested by ATC need be reported. (See 
14 CFR 91.183(a), 

IFR Communications

.) 

2.  DVFR flights and IFR flights in uncon-

trolled airspace: 

(a) 

The time, position, and altitude at which 

the aircraft passed the last reporting point before 
penetration and the estimated time of arrival over the 
next appropriate reporting point along the flight 
route; 

(b) 

If there is no appropriate reporting point 

along the flight route, the pilot reports at least 15 
minutes before penetration: the estimated time, 
position, and altitude at which the pilot will penetrate; 
or 

(c) 

If the departure airport is within an ADIZ 

or so close to the ADIZ boundary that it prevents the 

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National Security and Interception Procedures