Vic formation
（重定向自Vee formation）
The Vic formation is a formation devised for military aircraft and first used during World War I. It comprises three or sometimes more aircraft flying in close formation with the leader at the apex and the rest of the flight en echelon to left and right, the whole resembling the letter "V". The name is derived from the term for the letter V in the phonetic alphabet of the time. It is still in use today, though it has been superseded or replaced in some circumstances.