Herm Island / British European Airways
The tenant of Herm Island gained permission from the Post Office to handle mail from the Island to Guernsey. Covers, bearing a 2d Herm Island stamp surcharged 3d and overprinted "BEA Airway letter Service", were taken by motor launch to Guernsey and then flown by British European Airways to Northolt. The first day's mail was delayed by a storm, and bears a "Delayed by Storm" cachet.
7th August 1954.
Herm Island H3 overprinted in blue. Perf.: Rouletted.
3d on 2d
Red. Map of island and aircraft.
Overprinted "3D SURCHARGE / VIA / BEA / AIRWAY / LETTER / SERVICE" in blue.

The Story of the Airway Letter Service 1933-1988 D. Wilson, Air Mail News June 1994
The Airway Letter Service Supplementary Notes D. Wilson, Air Mail News December 1994