January 27 - French air-raid on Freiburg
No. 100 Squadron RFC, the first British night fighter squadron is formed.
Known as Bloody April. The Royal Flying Corps, while supporting the Arras offensive, loses 245 aircraft -- 140 in the first two weeks -- out of an initial strength of 365. Aircrew casualties are 211 killed or missing and 108 prisoners of war.
April 6 - the United States declares war on Germany
May 7 - British ace Major Edward Mannock claims his first kill.
May 7 - British ace Captain Albert Ball (44 victories) is killed in a crash following a dogfight with Lothar von Richthofen, who also crashes but survives.
May 9 - French ace René Fonck shoots down six German aircraft in a day.
May 19 - United States "star in a circle" national insignia adopted
May 20 - German submarine U-36 is sunk by an RNAS flying boat
May 25 - a mass air-raid by 21 Gotha G.V bombers attacks Kent.
June 13 - 14 Gotha bombers make the most destructive air-raid on London of the war. Attacking in daylight, 162 people are killed and 432 wounded.
August 2 - A Sopwith Pup flown by Sqn Cdr Edwin Dunning becomes the first aircraft to land aboard a moving ship, HMS Furious.
August 7 - Dunning is killed on his third landing when the Pup falls over the side of the ship.
September 3 - The US 1st Aero Squadron arrives in France
September 11 - French ace Capitaine Georges Guynemer goes missing in action. Kurt Wisserman of Jasta 3 is credited with shooting him down, but his body is never found.
September 26 - for the second time, French ace René Fonck shoots down six German aircraft in a day.
November 20 - the Battle of Cambrai (1917) begins
November 21-24 - the Zeppelin L 59 (LZ104) makes a 6,757 km journey through Africa in 96 hours (average speed 71 km/h).
Sopwith Camel flown by Harry Hawker
April 4 - SPAD S.XIII
Jun 22 - Port Victoria P.V.7
September 7 - Port Victoria P.V.8
September 14 - Fairey III
October 15 - Alcock Scout
November 30 - Vickers Vimy
Airco DH.4 with No. 55 Squadron RFC
Sopwith Triplane with No.1 (Naval) Squadron, Royal Naval Air Service
Royal Aircraft Factory S.E.5 with No. 56 Squadron RFC.
Bristol F.2A with No. 48 Squadron RFC