Pr.21B4 is a supersonic 3-th generation jet fighter and interceptor aircraft of Republican New-Ardennes Air Force. Based on MiG-21 scheme, this aircraft is modificated (like MiG-21/93) to use modern missiles, radar and aiming system.

Nicknames: Firefly (production name), Gorbatiy (in russian - camelback), Balalaika (in russian - stringed folk musical instrument).

Armament (on this variant):
- 1x 23-mm autogun
- 4x R-73 short-range missiles
- 2x K-77M or R-77 (RVV-AE) medium-range missiles

Controls:
- AG1 - autopilot
- AG2 - afterburner
- AG3 - navigation lights
- AG7 - drop all weapons

Screenshots:

Pr.21B4 during the test flights

Pr.21B4 launching K-77M missile

Pr.21B4 maneuvers near the Air Force base

Pr.21B4 on the runaway at the morning...

...and in the evening

Good flighs, pilots!