C525 pilot reported the wingman did not have a discrete code that was required for the airspace they...

Attributes
ACN	1688963
Time
Date	201910
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citationjet (C525/C526) - CJ I / II / III / IV
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	VFR Route
Flight Plan	VFR
Aircraft 2
Make Model Name	Citationjet (C525/C526) - CJ I / II / III / IV
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	VFR Route
Flight Plan	VFR
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 12000 Flight Crew Type 10000
Events
Anomaly	Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Deviation - Procedural Security

Narrative:

Two aircraft departed. We departed VFR climbed as a formation to 16;500 feet direct to our final destination. We called center at 9;000 feet climbing to 16;500 feet. I advised the controller we were 2 aircraft in formation. We received a single transponder code. One aircraft took the code and the other remained on 1200. We spoke to center and then approach until handed to tower. After landing we were informed that the second aircraft should not have crossed the ADIZ without its own code. I explained that center gave us a single code and was aware we were a flight of two aircraft. I was the pilot of the lead aircraft. Ground control told us they has spoken to center and it wasn't a big deal but be aware each aircraft should have a discrete code. After clearing customs I was advised that in the future be aware that both planes should have a code other than 1200. The customs person told me just be aware of this in the future.

Original NASA ASRS Text

Title: C525 pilot reported the wingman did not have a discrete code that was required for the airspace they flew through while in formation.

Narrative: Two aircraft departed. We departed VFR climbed as a formation to 16;500 feet direct to our final destination. We called Center at 9;000 feet climbing to 16;500 feet. I advised the Controller we were 2 aircraft in formation. We received a single transponder code. One aircraft took the code and the other remained on 1200. We spoke to Center and then Approach until handed to Tower. After landing we were informed that the second aircraft should not have crossed the ADIZ without its own code. I explained that Center gave us a single code and was aware we were a flight of two aircraft. I was the pilot of the lead aircraft. Ground Control told us they has spoken to Center and it wasn't a big deal but be aware each aircraft should have a discrete code. After clearing customs I was advised that in the future be aware that both planes should have a code other than 1200. The Customs person told me just be aware of this in the future.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.