On June 2, 2010, an unusual sight burst through the clear California sky: a Swiss plane painted with a peace sign and psychedelic lettering.

The Swiss International Airlines flight symbolizes a rekindled relationship between sister cities San Francisco and Zurich, two intricately linked regions.

As one of the few air carriers to expand its network rather than cut back in 2010, Swiss solidifies its commitment to connecting business and leisure travelers in the innovative hot spots.When the renewed service was announced, San Francisco Mayor Gavin Newsom said, “This route will further cement the ties between our two sister cities and provide passengers with a superior travel option to Zurich and beyond.”