This includes 79 of the 80 routes for all Swiss Airlines out of Zurich airport (Beijing Daxing International Airport is too new to have been included in the sim).

Most flights are high-altitude IFR, a few are low-altitude - depending on distance (mostly) and popularity of the destination. Some long-haul Asian destinations seemed overly looping on the map, but the flight time was correct down to a few minutes when I compared them to real life.

Also note that landing at London City will be tricky in large aircraft, given its ~5,000-foot runway.

To load your selected route, click "load/save" at the bottom of the World Map and navigate to the relevant folder. Note that the spawn location is set to the runway by default, so select your gate in the dropdown menu if you're looking to start cold and dark.

The routes:

Amsterdam, Netherlands
Athens, Greece
Bangkok–Suvarnabhumi, Thailand
Barcelona, Spain
Belgrade, Serbia
Berlin, Germany
Bilbao, Spain
Birmingham, UK
Bordeaux, France
Boston, U.S.
Bremen, Germany
Brindisi, Italy
Brussels, Belgium
Bucharest, Romania
Budapest, Hungary
Cairo, Egypt
Chicago–O'Hare, U.S.
Copenhagen, Denmark
Dar es Salaam, Africa
Delhi, India
Dresden, Germany
Dubai–International, UAE
Dublin, Ireland
Düsseldorf, Germany
Florence, Italy
Frankfurt, Germany
Gdańsk, Poland
Geneva
Gothenburg, Sweden
Gran Canaria, Spain
Graz, Austria
Hamburg, Germany
Hanover, Germany
Hong Kong, PR China
Johannesburg–O. R. Tambo, South Africa
Kraków, Poland
Kyiv–Boryspil, Ukraine
Lisbon, Portugal
Ljubljana, Slovenia
London–City, UK
London–Heathrow, UK
Los Angeles, U.S.
Luxembourg City, Luxembourg 
Madrid, Spain
Málaga, Spain
Manchester, UK
Marseille, France
Miami, U.S.
Milan–Malpensa, Italy
Montreal–Trudeau, Canada
Moscow–Domodedovo, Russia
Mumbai, India
Munich, Germany
Nairobi–Jomo Kenyatta, Africa
Naples, Italy
Newark, U.S.
New York–JFK, U.S.
Nice, France
Nuremberg, Germany
Oslo, Norway
Palma de Mallorca, Spain
Paris–Charles de Gaulle, France
Porto, Portugal
Prague, Czech Republic
Rome–Fiumicino, Italy
Saint Petersburg, Russia
San Francisco, U.S.
São Paulo–Guarulhos, Brazil
Shanghai–Pudong, PR China
Singapore
Stockholm–Arlanda, Sweden
Stuttgart, Germany
Tel Aviv, Israel
Tokyo–Narita, Japan
Valencia, Spain
Venice, Italy
Vienna, Austria
Warsaw–Chopin, Poland
Wrocław, Poland