'Busses' has always been an accepted spelling for the plural along with 'buses' (both valid spellings AFAIK).abbey road d enfer said:Webster has a sympathetic view to the different spellings but Oxford and Cambridge ignore buss.
https://www.merriam-webster.com/words-at-play/plural-of-bus
http://www.oxfordlearnersdictionaries.com/spellcheck/english/?q=buss
I personally use buses, to reduce confusion about how to spell the singular. It is easy to ASSume that the singular of busses, is buss, while nobody ASSumes the singular of buses is buss.
JR
PS Still sorry about the veer