“The potentially dire consequences from such actions cannot be overstated." Source: NBAA president and CEO Ed Bolen, in a "Call to Action" to members concerning user fees for a privatized ATC proposed by House Transportation Committee chair Bill Shuster (R-PA).
The Czechoslovakian L-39 was built as the successor to their earlier trainer, the L-29 Delfin. Design work began in 1966, and the first prototype made its initial flight on 4 November 1968.