The difficulty to make money out of this might be to determine the delay with some accuracy, not just that there will be some delays. Flight are routinely delay

The difficulty to make money out of this might be to determine the delay with some accuracy, not just that there will be some delays. Flight are routinely delayed by tens of minutes (has a low-cost flight ever left on time?) and that won't award compensation. European laws define mandatory compensations when a flight is delayed or cancelled. This starts after 30 minutes if I remember well and depends how long the delay is and how long (distance) the flight is. Also, delay is measured on arrival time, not on departure time. Planes frequently depart late then arrive on time, because they fly faster to catch up.