A US President definitely has the authority to restrict what is used on Government contracts. The Gov is the buyer so they can and do ask what they do and do not want used by the federal contractors.
Can a US President dictate for non-Gov contracts? Strong to weak to none. Strong around infrastructure providers (think power, water, electric, etc.) through the Defense Production Act of 1950 (DPA). This is where this EO falls, "banning certain foreign-manufactured equipment from the U.S. bulk-power system".
Conjecture, but i think this is targeting data centers...
This is not a US-only airport staff issue. I am on the road most of the last three decades and it is international. It is one, binding "quality" in every country. Most the airport staff's core competency rests elsewhere in almost all airports.
I am hedging because i have had nuggets of exceptional service and support here and there, even in nightmarish hellscapes like Heathrow. Flight attendants are a whole different area of joy and fears...
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