Earlier quoted context omitted.
The flight time requirement for a commercial pilot is only 250 hours. All flight instructors are commercial pilots. They are more common than you think.
Also, isn't there a pretty big distinction (even just in terms of required flight hours) for Commercial versus Airline Transport (ATP)? ISTR that ATP required at least 1k hours.
True, but in an emergency, the FAA probably wouldn't make a fuss :)