Just in, another possible factor...
ATCSCC ADVZY 006 CYYZ/CZY 08/15/03 GROUND STOP CANCELLATION
DESTINATION AIRPORT: CYYZ
RELEASED FACILITIES: ALL
REMARKS: THE GTAA HAS ADVISED THAT
CUSTOMS SERVICES ARE NOT AVAILABLE AT
CYYZ UNTIL FURTHER NOTICE.
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.