Jane's 1960-61 says normal capacity for the 707-320/420 was 21200 US gallons, optional 23590.
The item was in The Aeroplane for 6 Jan 1961:
"Pan American completed what is believed to be the first non-stop commercial flight between London and Los Angeles on Jan. 1. Flight PA121 (Capt. Eugene Myring) left London at 16.19 hrs. G.M.T. on Dec. 31, and reached Los Angeles (5,140 naut. miles) in 11 hr. 42 min., carrying 37 passengers, 13 crew and 8,500 lb. of freight. It left London Airport at max. weight with full tanks (155,000 lb. fuel) and had 13,000 lb. of fuel unburnt on arrival. There was nil wind component, the average speed being 436 knots."
Last edited by Tim Zukas; 25th Jun 2009 at 02:03.
Reason: typo