I did a Google search (google.com) for "Cancelled flights" and "Canceled flights".

12.8M Cancelled Flights
5.2M Canceled Flights

So, it depends on what you're after.

If you're looking for fewer canceled flights and less hassle and delays when flying ... go with "canceled". :-)
Otherwise, if you don't more than twice the hassle and delays when flying, go with "cancelled". :-)

Your choice, Naomi. :-) I'm sticking with "canceled". :-)


>Hi everybody,
>
>I've checked this link http://grammarist.com/spelling/cancel/ but I am not 100% sure which spelling should I choose. The software is written by US company, but may be used by US, Canadian, NZ and Australian clients. It may also be used internationally in other countries.
>
>So, just wondering what spelling do you prefer in your code?
>
>Thanks in advance.