After having just been through this with Delta Airlines I have again learned to "read the voucher" unless you want to be taken for ride like Delta did to us.
Coming back to the USA from CDG our departure was delayed 1.5 hours which caused us to miss our connecting flight in Detroit and be rescheduled the next day. Delta was being "nice" to us, told us they would put us up for the night, gave us hotel vouchers to the local Radisson and sent us on our way.
Radisson took our vouchers along with a credit card for incidentals and that should have been the end of the story. However, 2 weeks later charges showed up on our credit card from Radisson because according to them Delta's vouchers said "BILL TO CUSTOMER". Radisson sent us copies of the vouchers and sure enough Delta gave us vouchers for a hotel that we had to pay ourselves.
Great going Delta - you've now reinforced that I must read the fine print which I should have already known. Why on earth did I just trust blindly that Delta was actually going to do what they SAID they would do?? Radisson said every Delta customer who checked in that evening had the same "BILL TO CUSTOMER" voucher.
So - read your vouchers and don't just "assume" that airlines are actually taking care of you.