Looks like an L-39ZA, with all the additional hardpoints.
The “ZA” is the light attack version of the L-39 and was the ‘definitive’ first-generation Albatross. With a belly gun pod housing twin 23mm cannons, reinforced wings, hard points for carrying fuel tanks and munitions, stronger landing gear, and larger brakes, the “ZA” has a more “tactical” look to it.
(From Worldwide Warbirds, a site that sells these birds (and even MiG29s)
