sentences:  These load factors were much higher than BOAC's, as a result of which the independents doubled the flight frequency on their London-Nairobi "Safari"/colonial coach route to once-a-week.This service proved to be so popular that a second weekly frequency was eventually added, which was operated alternately by each airline.In June 1953, Airwork and Hunting jointly launched a fortnightly "Safari"/colonial coach service between London and Salisbury, entailing one round trip per month by each company.