LGS,
There was another factor which you may remember.
3 years before with rising fuel prices operators decided to add a fuel surcharge on all flights. This amount was finalised 2 weeks prior to departure and punters were sent a supplementary invoice which had to be paid prior to departure. The amount was not even known until the bill arrived.
All operators did this so there was no escape.
Needless to say it was not popular.
In 1973 Thompson advertised NO fuel surcharge so all operators had to follow suit.
That winter Court was flying Caribbean operators so the fuel bite was hard.