karel wrote:

How so?

The situation that generated this discussion is called "cabotage." As Bob Moore
posted, it is defined as "the carriage of air traffic that originates and
terminates within the boundaries of a given country by an air carrier of another
country. An example of this would be an airline like Virgin Atlantic Airways
operating flights between Chicago and New Orleans."

Since Amsterdam and Paris are in different countries, cabotage regulations would
not apply. Allowing this sort of flight is not unusual.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.