Adam1222

The US is a country of positive regulations. If there is no regulation that applies, I can't prove that nothingness to you. But i guess my source would be the CFR (Code of federal Regulations), which contains no applicable regulation.

Also there's something called the presumption against extraterritoriality.

But if you don't believe me, you can check out DOT's FAQs about its regulations, available at http://airconsumer.ost.dot.gov/rules/rules.htm

You can also review the regulation itself on schedule changes, which applies to "Each covered carrier for its scheduled flights to, from or within the U.S." https://www.law.cornell.edu/cfr/text/14/259.8 (and doesn't even say what folks here assume (i.e., that it requires you to be rebooked on a flight of your choosing)).

Should you desire support for the notion that DOT's consumer pricing rules only apply to "advertisements of foreign carriers, among others, that are marketed to United States consumers for air transportation within, to, or from the United States", you can check out this order involving Tarom https://www.transportation.gov/airconsumer/eo-2014-4-18.

So, if you have any support for the notion that some DOT regulation applies to air transportation wholly outside the United States (i.e., not "within, to, or from the United States"), please enlighten me.