Apparently, having the arms of an american football Quarterback helps !

http://espn.go.com/espn/page2/story/_/id/7625552/former-cal-quarterback-joe-ayoob-sets-world-record-longest-throw-paper-airplane

I fly paper planes all the time; trimming one to fly that straight is very difficult

Hey Sunlikestar,
just make one more fold at the wings like a ridge line,and you will get straight flight, after some practice..