The Seppos don't always get it wrong. On their fuel trucks you see 'Flammable'. The Poms say 'Inflammable'. Fuel that won't burn, what next? We add useless extras e.g. the 'u' in 'colour' the 'me' in 'programme' the quaint spelling of 'cheque' etc. As language evolves we will see more American English and ye olde shoppe will become the store, or maybe eventually the stor.
With so many manuals and rules written the American way, airplane will win just as landing gear eventually replaced undercarriage. Better than having to learn French.