The World's Longest Flight by Singapore Airlines

I'm really looking forward to travel in the world's longest flight with Singapore Airlines to New York to watch Broadway musicals and explores museums. I last visited New York in 2011 to watch Jersey Boys, Wicked and Spiderman broadway musicals and explore art and design museums alone. It was a very long journey with stopover in Dubai and I had to wait for about 3 to 7 hours for stopover. 

There are so many places I want to travel. Especially Switzerland and maybe New York later since I already went there. However I read that if I wait for 3 to 4 years later, Singapore Airlines might be dethroned by others airlines. Most probably I travel to Switzerland to explore various museums and hiking next year or the year after. I'm really mesmerised by the natural beauty of Switzerland.