Legally, they apply ONLY to that executive's employees and any property under their legally-limited purview. Here's an open letter to all airlines…
I thought I would educate you on the “federal law” you cite as justification for your mask policy.
"Are Executive Orders Law? The Short Answer: No, they are not in and of themselves law. The Middle Answer: Executive Orders may carry the “weight of law,” but only insofar as…
1. They're directed to a department or other government entity under the Constitutional authority of the President of the United States of America; and, [emphasis mine]
2. The orders themselves DO NOT VIOLATE THE CONSTITUTION itself or any local, state, or federal statute which lawfully derives its authority from the Constitution."
I am sure this will fall on deaf ears, but I will not be using your airline unless/until you rescind your ridiculous mask mandate."
Read, listen or watch here: ryoc.us/are-executive-orders-law
UPDATE: See also: how-to-effectively-resist-tyranny-without-direct-confrontation-threats-or-danger/