This is a list of aviation-related events from 1921:

Events

• Bessie Coleman attends flying school in France and became the first licensed African-American female pilot.
• Mexicana de Aviacion begins service.

June

• Boeing wins a $1,448,000 contract to build 200 Thomas-Morse MB-3 fighters for the US Army, allowing the company to abandon furniture-making.
• June 8 - the US Army carries out the first experiments in cabin pressurisation, using a de Havilland DH.4.
• June 13 - the US Army and Navy begin trials in Chesapeake Bay to test the effectiveness of aircraft in attacking ships. The captured German destroyer G-102, light cruiser Frankfurt and battleship Ostfriesland will all be successfully sunk by aerial bombing.

July

• Douglas Aircraft Company founded.

August

• August 11 - Schneider Trophy race flown at Venice, Italy. In an all-Italian field, Giovanni De Briganti won the race in a Macchi M-7. Speed 189.7 km/h (117.9 mph).
• August 24 - British Airship R-38 breaks up over Hull, Yorkshire during trials, killing 44 people.

September

• September 19 - the first regular scheduled airline service in Latin America commences, with Colombian airline SCADTA operating float-equipped Junkers F.13s between Barranquilla and Girandot.

October

• The RAF takes over from the Iraq
• October 15 - the Spanish airline Compania Española de Trafico Aereo is established - it will eventually form part of Iberia Airlines.

November

• The 6th Salon d'Aeronautique is held in Paris. The Breguet 19 is unveiled.
• November 5 - Curtiss test pilot Bert Acosta wins the Pulitzer Trophy in a Curtiss CR-2 and establishes a new closed-circuit airspeed record of 284.36 km/h (176.7 mph).

December

• December 5 - The first regular air services in Australia commence, with West Australian Airways.

First flights

April

• April 19 - Short Cromarty flying boat

May

• Boeing GA-1

Entered service