For why this is not possible even in principle, have a look at https://static.googleusercontent.com/media/www.itasoftware.com/en//pdf/ComplexityofArlineTravelPl

For why this is not possible even in principle, have a look at https://static.googleusercontent.com/media/www.itasoftware.com/en//pdf/ComplexityofArlineTravelPlanning_Carl_Sep-03.pdf https://static.googleusercontent.com/media/www.itasoftware.c... (a really fascinating doc)