Left-39 flight crew reported a near midair collision during unusual attitude training.

Attributes
ACN	1480154
Time
Date	201709
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Albatros (L39)
Operating Under FAR Part	Part 91
Route In Use	None
Flight Plan	None
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Function	Instructor
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 360 Flight Crew Total 18900 Flight Crew Type 1230
Person 2
Function	Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 3300 Flight Crew Type 700
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 200 Vertical 300

Narrative:

We were performing air work southeast of ZZZ in the 10;000 to 17;000 of altitude block. I had just given trainee nose high unusual attitude when we received traffic warning from ads-B in/out avionics installed in aircraft. I looked out left side of aircraft (direction of traffic warning) observed airliner slightly below our altitude. I took control of aircraft and rolled wings level and began a climb to avoid airliner.

Original NASA ASRS Text

Title: L-39 flight crew reported a NMAC during unusual attitude training.

Narrative: We were performing air work southeast of ZZZ in the 10;000 to 17;000 of altitude block. I had just given trainee nose high unusual attitude when we received traffic warning from ADS-B in/out avionics installed in aircraft. I looked out left side of aircraft (direction of traffic warning) observed airliner slightly below our altitude. I took control of aircraft and rolled wings level and began a climb to avoid airliner.

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.