The Royal Aero Club aviator's certificate
A pilot of the twenties who had passed the tests of the Fédération Aéronautique Internationale carried the aviator's certificate of his country's aero club: in Britain, the Royal Aero Club of the United Kingdom. It was a small leather card: the club's name and address, AVIATOR'S CERTIFICATE, granted to, the date, the number and the Chairman's signature on the left leaf, the holder's photograph on the right.
Bearer prints it off a certificate of 1910 read on its card. The pilot's licence the Air Ministry issued under the Air Navigation Order, which a pilot flying for hire also needed, has not been found and is not printed.
Bearer makes an investigator's papers for Call of Cthulhu and any 1920s or 1930s tabletop campaign: the passport a consul would have filled in, with the visas and frontier stamps a campaign leaves in it, and the permits, certificates and tickets of the period, to print or to share.
An example

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The paper
| Offered | from 21 October 1920 |
| Printed in | English |
| Sheets | 2 |
| How it is known | read off a document of the period |
Still to be confirmed
- the certificate read was granted in 1910; the club's printed address after it left 166 Piccadilly has not been found, and the old one is printed for every date. What would settle it: a Royal Aero Club certificate of the twenties or thirties.
- the Royal Aero Club granted these certificates as the Fédération Aéronautique Internationale's authority in the British Empire; the pilot's licence the Air Ministry issued under the Air Navigation Order is another paper, not printed. What would settle it: an Air Ministry pilot's licence of the period.
- the size of the card. What would settle it: a certificate measured.
Sources
- Royal Aero Club of the United Kingdom; photograph on Wikimedia Commons ('Aviator Cert.jpg'), Royal Aero Club of the United Kingdom, Aviator's Certificate No. 34, granted on 22 November 1910, the card opened: on the left ROYAL AERO CLUB / OF THE / UNITED KINGDOM. / 166, PICCADILLY, LONDON, W., AVIATOR'S CERTIFICATE, Granted to, Date, No., the Chairman's signature; on the right the holder's photograph (read directly)
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