Graham White Aviation was contracted to carry mail between London and Windsor as part of the celebrations for the coronation of King George V. The service was officially sanctioned by the Postmaster General, operating from 9th to 16th September 1911. Postcards and envelopes, which were specially printed for the flights, were carried for a fee of 6˝d per postcard and 1/1d per envelope, the proceeds going to charity. The mail was carried by two Farman biplanes, one of which crashed on the first day, and two Bleriot monoplanes.

A first air mail was flown from Galway via Dublin, Croydon and Rotterdam to Berlin on 22nd October 1932. A green cachet 'Aer-Post / Gaillim-Berlin' and an arrival cachet 'Mit Luftpost Befordert / Luftpostamt / Berlin C2' was applied to covers. No mail was carried on the return flight on 23rd.

On 1st July 1933 East Yorkshire Motor Services started an air service across the Humber. The company issued blue and silver advertising labels which were fixed to parcels and freight. Five covers with the labels attached were flown on 2nd November 1933 between Hull and Grimsby, and posted on arrival. The service ended on 4th November 1933.

During the London International Air Post Exhibition (Apex), held during the week commencing 7th May 1934, a post office was set up and a special postmark used on mail posted at the exhibition. Labels were issued which were attached to mail posted at the exhibition. The labels were printed in six colours: brown, green, red, orange, blue and purple. Commemorative postcards were also issued, and an 'Apex' cachet was applied on request to mail.

There were two unusual attractions during the exhibition. Firstly, a souvenir pigeon post, using pigeongrams printed on very thin blue paper. Also, on the second day a stamp dealer arranged an autogiro flight from Hanworth over the route of the 1911 Coronation flight. With the permission of the Postmaster-General it carried souvenir postcards with a 'By autogiro' red cachet and a black on blue label. They were posted at the exhibition, having also received the exhibition postmark.

The Post Office authorised London, Scottish and Provincial Airways to carry mail despatched from the Post Office Exhibition held in Nottingham to London. A fee of 4d per letter was charged, and on 23rd May 1934 the mail was flown from Tollerton to Radlett, in Hertfordshire, and was then taken by road to London.

KLM carried mail between Liverpool and Hull to Holland. No mail was carried between Liverpool and Hull initially, but from 1st June 1934 the airline was granted a contract to so. A service via Doncaster was added from 1st July 1936.

The Post Office awarded Hillman's Airways an airmail contract from 1st December 1934 between London and Glasgow via Liverpool and Belfast, formerly operated by Railway Air Services. No official covers were produced but the airline approved designs by John S. Davis. The Post Office contract ended on 30th November 1935, returning to Railway Air Services.

Blackpool and West Coast Air Services (who later shortened their name to West Coast Air Services) were awarded a contract by the Post Office to fly first class mail between Liverpool and Ronaldsway, Isle of Man. The service started on 1st February 1935. The company used their own covers, which bear their crest in green on the flap, as souvenirs of the flights, and privately produced covers, bearing the company crest in black on the front bottom left of the envelope, were also flown. Towards the end of the year the contract was transferred to United Airways. However, West Coast Air Services were awarded the Liverpool to Ronaldsway contract again, beginning services on 2nd November 1936. The contract then passed to Isle of Man Air Services in September 1937.

Towards the end of 1935 United Airways serviced the Post Office air mail contract between Liverpool and Ronaldsway until it was returned to West Coast Air Services in November 1936.

Covers were flown between Amsterdam and Doncaster, Amsterdam and Liverpool, Rotterdam and Doncaster, and Rotterdam and Liverpool on 5th August 1936.

Having been awarded the Liverpool to Ronaldsway mail contract previously flown by West Coast Air Services, Isle of Man Air Services began their mail flights on 26th September 1937. Services continued until the outbreak or war on 3rd September 1939, but is said to have resumed from 1st January 1940. Isle of Man Air Services became part of British European Airways from 1st February 1947, who introduced an Airway Letter service from Manchester, Liverpool, Douglas and Belfast on 1st November 1949.

Air Lingus carried mail for the Irish Post Office, with no additional fee, one way only between Dublin and the Isle of Man from 1937. The first season was between 1st July and 31st August 1937, but no mail seems to have been carried. The second season's flights ran from 4th June to 19th September 1938, and the third season began on 5th June 1939, intending to end on 19th September, but due to the outbreak of war, actually ended on 31st August.

The Post Office granted Jersey Airways a contract to fly mail between Jersey and the mainland, which commenced on 1st June 1937. Letters which were posted after the evening mail boat left were flown without an air fee. The airline applied a cachet to covers for the first air mail flight on 1st June.

The Airline flew a large philatelic mail on 23rd November 1937 between Aberdeen and Lerwick.

The Airline flew first flight covers on their airmail service Southapton-Guernsey on 8th May 1939 and Guernsey-Southampton on 22nd May 1939.