On the recordMarch 22, 2010
The slot conversion provision ensures that service to small and medium hub airports within the perimeter would not be affected. There is no restriction, however, on converting a flight that currently serves a large hub airport within the perimeter to a small or medium hub airport beyond the perimeter. So, presumably the Ensign amendment could expand service to small and medium hub airports beyond the perimeter.
Said by
John Ensign
Source
govinfo.gov