Also, during the 70s, 80s and early 90s EI operated a number of 737QC aircraft which could be configured as all-freight, al- pax or combi aircraft. They operated as pax or combi during the day and were converted to freighters at night.One operated DUB-LHR-DUB every morning with a schedule that ensured its arrival just as LHR opened. Not to forget the Carvairs (converted DC-4s) which operated as car and horse ferries during the 60s and which were preceded by the Bristol Freighters during the 50s.