http://www.globes.co.il/en/article-fairfly-finds-lowest-airfares-in-israel-1001005782
Seems like it only works on tickets that can be canceled,
-1
"From this point and on until flight time, the company’s service kicks into real time action. The service monitors the Internet and international airfare databases, and
searches for a cheaper fare, factoring in the ticket’s cancellation fee. The system then alerts the user if it finds an option that costs at least 5% less than the original ticket, after fees, or saves $50 (the higher of the two)."
