Back in the late 70s as a young engineer for BMA we had some 707s flying for Air Algerie, at one stage we were desperate for tyres, eventually mission control at EMA promised to send some, we were hoping for 6, 8 maybe 10, they sent a Viscount direct to Algiers, two wheels, then turned round and went straight back, was that max load for a Viscount on a flight that long?