I don’t understand your point. The FAA isn’t a business, it’s a regulatory agency.
Where the US has the right distance/population density mix, we have high-speed rail - Acela - Boston/New York/Washington.
Elsewhere in the country, it just doesn’t make sense. They’ve been talking about a high-speed link from LA to Vegas for almost 20 years now, but no one can crunch the numbers in such a way as to make monetary sense.
If only that were so!
The FAA spends billions directly subsidizing the airlines and many billions more financing airports. But nobody says: "when will the FAA make a profit?" Or "when will the interstate highways make a profit?" Or "when will the Coast Guard and the Army Corps of Engineers make a profit on waterways?" They just take for granted the hundreds of billions in federal subsidies for oil burning transit. However, if one says anything about clean efficient trains, people always ask if there will be a profit.