The earliest Soviet jet fighters were all straight-winged as the aerodynamic benefits of swept wings at transonic speeds was not yet appreciated for several years after the end of World War II when these fighters were designed. * Alekseyev I-21 * Alekseyev I-212 * Lavochkin La-150 * Lavochkin La-152 * Lavochkin La-154 * Lavochkin La-156 * Mikoyan-Gurevich MiG-9 * Sukhoi Su-9 (1946) * Sukhoi Su-11 (1947) * Sukhoi Su-13 * Yakovlev Yak-15 * Yakovlev Yak-17 * Yakovlev Yak-19 * Yakovlev Yak-23 * Yakovlev Yak-25 (1947)