How about Imperial Airways?
Imperial Airways Limited was formed in March 1924 from the
British Marine Air Navigation Company Ltd (three
flying boats), the
Daimler Airway (five aircraft),
Handley Page Transport Ltd (three aircraft) and the
Instone Air Line Ltd (two aircraft).
A friend used to work for them as a Radio Officer. Says that their first aircraft had wickerwork seats that were not fastened to the floor. They were probably more comfortable than some of the current seats.
He used to fly the route from London to Johburg, can't rememebr how many days it took.