@JustMyView13
Rebooting flights like this is a nightmare
Say you have a plane of 200 passengers. (Lots of planes will be far far larger than this) going from Glasgow to London.
If you scheduled it for next week, then very few of those people would want the rebooking. As evidenced on this thread, half the people would decide not to go (cant be bothered, holiday would be over by the time they got there) lots would just get train and plenty would have already booked via an alternate provider.
The reality is that there is about 1500 flights impacted currently, some of those planes will fit about 500 passengers in each. Your looking at an easy half a million passengers.
Slowly those people will be contacted and plans made. Rebooking a flight for tomorrow and you'd get a big chunk of passengers, next Tuesday less so
Along with the drama of them not knowing where their and staff planes will be.
Its the same reason you can book train tickets while there's problems on the rails, people simply have a raft of things to get through and no idea how to do it