EDIT: the trend holds pretty well at the footlong size (which is a big sandwich). 18/26 sandwiches they offer are >1000 calories.
Secondly, I can't see how you can get to 1320 calories for a footlong italian going by this: https://www.subway.com/en-gb/-/media/emea/europe/uk/nutritio...
Even counting footlong bread + footlong Italian Sub it only comes to ~1100.
And as it makes clear, a footlong is 2 6" servings, it's disingenuous to pretend that's a sandwich.
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EDIT: the trend holds pretty well at the footlong size (which is a big sandwich). 18/26 sandwiches they offer are >1000 calories.