Alberto, "Zanahoria" ('Carrot') and "Jabato" ('Brave Wild Boar'), three students from the Parachute School of the Spanish Army, form the "Trinca del aire" ('threesome of the air'): friends, good companions, but rivals and competitive in love affairs. When Nati, a beautiful foreign woman with whom Alberto falls in love, appears, jealousy will cause situations that will endanger their great friendship.