with summer holidays around the corner, here is a globe-trotting fact for you. air travel worldwide is set to double to 7.8 billion passengers according to the international airport association. and it brings me to my question. what was the busiest international air route by number of flights over the past year? kuala lumpur to singapore, beijing to coukuala lumpur, new york to london or london to mumbai? stay tuned and we'll tell you the correct answer. this week's book is "us versus them." ian bremer is clear-i'd eyed ab the global capitalism. he intelligently sketches out the problem and possible paths forward. the answer to the gps challenge question is a. according to a report by