Yup, BOAC, 737 of course. Boeing offers the ETOPS warning as standard equipment and you have to pay extra to get the lower warning threshold. Since some airlines rather do not pay for that the crews have to put up with the too early warning and are legally bound to do the low fuel checklist even if they never fly ETOPS on their 737s. In my previous company OPS had to correct reserve fuel to 1900kg if it was lower to prevent that.