When it comes to bad weather, you're probably out of luck looking for any compensation:
"With cancelled flights, you won't receive compensation if . . . the cancellation was due to extraordinary circumstances, for example due to bad weather..."
"An operating air carrier shall not be obliged to pay compensation in accordance with Article 7, if it can prove that the cancellation is caused by extraordinary circumstances which could not have been avoided even if all reasonable measures had been taken."
I don't think this requires or depends on how an aircraft is equipped.
Still, even in these circumstances the airline is "required to offer you either:
* a ticket refund (in full or just the part you have not used)
* alternative transport to your final destination at the earliest opportunity or
* rebooking at a later date of your choice (subject to seat availability).
Airlines must also provide assistance, when necessary, while you are waiting for alternative transport."
Air Passenger Rights - Cancellation
On top of all that, you're dealing with Hungarians! Good luck with that!
