Cloud Cutter
The liability of an airline is to get passengers to their destination one way or another. Where overnight accommodation/meals etc are required, these should be provided by the Airline in event of crew/aeroplalne unserviceability.
Nothing worse than an unserviceable flight attendant!!
Weather and other elements beyond the immediate control of the airline is technihally not covered.
In most cases, the accommodation/meals are carried by the mainline carriers as a matter of course to engender good passenger relations even if the cancellation is "Act of God" related, much in the same way that airlines like EK, JL and KE provide STPC accommodation for passengers with scheduled overnights or over 6 hours on the deck. Hope this clarifies a murky question. It probably will not. LCCs seem to walk away from any liability and say "you can have your money back", although I have heard a few positive things about DJ transferring psgrs to QF on an FIM. It is nice to see that some standards remain.
Best all
EWL