And it now looks like SQ378 may be operating direct to Barcelona - the Flight Status has now eliminated Milan and has it arriving in Barcelona an hour ahead of the Scheduled time.
Assuming there is a crew to operate SQ377, it will be interesting to see whether they delay it until Milan is open again, or do the return direct as well. Direct would probably be good for the passengers too - no doubt lots of empty seats with no Milan stop.
Edit at 15:30 - have to love the live flight tracking as
http://www.flightradar24.com/ shows SQ378 at FL370 just west of Corsica now.