I know plenty of business travelers who use public transportation, but it depends on how well the airport is served by transit and whether the transit connects directly to your destination. Even in New York it varies by which airport you're using. At Newark or JFK, which are easily accessible by transit, you see plenty of business travelers on the trains. OTOH, at LaGuardia, which can be a pain in the ass to reach by transit -- since it's only accessible by bus -- it's rare to see business travelers using public transportation.
Plus, a lot of business travelers are reimbursed for ground transportation expenses, which puts extra incentive for using more inexpensive modes when convenient.
I also have seen plenty of business travelers going for the Heathrow Express in London after landing, though I've never used it myself.
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