Flight 29 May 1919, p. 697: "When we were about 12½ hours on our way the circulation system was still giving trouble, and we realised we could not go on using up our motor power. Then it was that we reached the fateful decision to play for safety. We changed course, and began to fly diagonally across the main shipping route for about 2½ hours, when, to our great relief, we sighted the Danish steamer, which proved to be the tramp Mary. We at once sent up our Verey light distress signals. These were answered promptly, and then we flew on about two miles and landed in the water ahead of the steamer." "The Transatlantic Flight: Hawker and Grieve Retrieved". Flight. Vol. XI, no. 544. 29 May 1919. pp. 694–697. Retrieved 12 August 2023.
Flight 29 May 1919, p. 696: Text of signals between Lloyd's Thurso station and the Mary]: "The official news was made known by the following message from Lloyd's :— May 25.—No. 1. Lloyd's signal station at Butt of Lewis telegraphs this morning as follows :— Danish steamer Mary passing eastwards signalled following :—'Saved hands Sopwith aeroplane.' Station signalled:—'Is it Hawker?' Steamer replied:—'Yes.'
Note.—The Danish steamer Mary left New Orleans 28 April for Horsens (Denmark)." "The Transatlantic Flight: Hawker and Grieve Retrieved". Flight. Vol. XI, no. 544. 29 May 1919. pp. 694–697. Retrieved 12 August 2023.
