Because the US is big and fuel is expensive. LA -> Denver is 837 miles. (http://www.wolframalpha.com/input/?i=distance+from+los+angeles+to+denver http://www.wo

Because the US is big and fuel is expensive. LA -> Denver is 837 miles. (http://www.wolframalpha.com/input/?i=distance+from+los+angeles+to+denver http://www.wolframalpha.com/input/?i=distance+from+los+angel...) London -> Rome is 892 miles. (http://www.wolframalpha.com/input/?i=distance+from+london+to+rome http://www.wolframalpha.com/input/?i=distance+from+london+to...) LA -> NYC is 2,462 miles. (http://www.wolframalpha.com/input/?i=distance+from+los+angeles+to+new+york+city http://www.wolframalpha.com/input/?i=distance+from+los+angel...) You can fly the longest flight I can think of in Europe in the same distance. (http://www.wolframalpha.com/input/?i=distance+from+Lisbon+to+Moscow http://www.wolframalpha.com/input/?i=distance+from+Lisbon+to...)