The Letov Š-25 was a Czechoslovak single-engined, two-seat biplane trainer. It was designed by Alois Smolík at Letov Kbely.
The Š-25 was a biplane trainer with a metal frame and linen skin. It competed with the A-46 and BH-41 for the Czechoslovak Air Force contract for a new trainer aircraft. Although displaying good flight characteristics and short takeoff and landing, the Š-25 lost out to the BH-41.[1]