Here's the first few lines of the e-mail I received from SWISS today:

Dear Mr. Anvari,
SWISS officially took to the skies with the start of the summer timetable on March 31, which is valid from now until October 26. Print copies are available from our city and airport ticket offices or from your travel agent. To be sure you have the most up-to-date version of our flight schedule, we recommend that you download the timetable from our new website address: http://www.swiss.com. For maximum speed and convenience, you can also book your flight online, too.

Swissair simply ran out of cash and stopped flying yesterday. More information at Swissair.com.