From the Mexicana website:
"Domestic Flights continue to operate
and can be purchased normally
as they are operated by MexicanaClick and MexicanaLink,
unaffected by Compañía Mexicana de Aviación (CMA)
CMA has suspended its flight sales but continues to operate its flights
as scheduled to protect its passengers."
see : http://www.mexicana.com/cs/Satellite?pagename=MexicanaG5_US_EN/Page/RedirectSiteAlterno_US_EN