[2] An example of a change of gauge flight from a larger aircraft to a smaller aircraft during the early 1970s can be found in the Pan American World Airways (Pan Am) April 29, 1973 system timetable with Pan Am flight 295 from New York John F. Kennedy International Airport (JFK) nonstop to San Juan, Puerto Rico (SJU) being operated with a Boeing 747 with the continuation of Pan Am flight 295 from San Juan nonstop to Port of Spain (POS) being operated with a Boeing 727 with through passengers from New York City to Port of Spain being required to change aircraft in San Juan.
Some passengers, such as persons with disabilities or who otherwise are not disposed to make a connection, prefer to book on flights without a change of aircraft.
However, passengers could incorrectly assume that if they are traveling on a single flight number they will not be required to change planes.
Single flight numbers are typically used for an originating domestic to international destination or the return (e.g., San Francisco to Chicago to Paris).
Part 258 requires the air carriers to inform the consumer that there is a change of gauge in the itinerary before the reservation is made.