Yes, in fact the forms in parentheses are both in common use for the USA.
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imantaghavitravel>>travelling(traveling)
model>>modelling(modeling)
imantaghaviI wonder if the forms in parenthesis are also possible!Not only are they possible, in the US, many verbs ending with "el" are spelled with one "L", i.e. "traveling", "labeling" and "modeling" etc...
imantaghavitravel>>travelling(traveling)See
model>>modelling(modeling)