Knots are a perfectly acceptable and sensible method of expressing speeds for aviation. Before changing that perhaps it would make more sense for the Yanqis to adopt metric measures and weights for fuel rather than using the US gallon measurement which is easily confused with the proper gallon which even us Brits have largely given up on (as it would cause us a severe brain haemorrhage and fit o rage) when buying petrol for our cars as it currently cost about £6.50 per gallon.