hi,
i don't think there would be a charge for adding another night.when i spoke to cro last week the lady on the phone said that upgrades are not charged.since your adding a night,i can't see them charging you.good luck!!
I added an 8th night to my 7 night reservation and was not charged a change fee. My understanding is that as long as your cost increases, they don't charge you a change fee.
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