https://www.nytimes.com/2025/04/24/travel/frontier-volunteer-voucher.html
“Be wary of anything a gate agent promises you verbally, and always politely try to get a receipt or other written evidence. Ask to watch as the agent enters your information, and take a picture of the screen and the agent — with consent. Favor cash over vouchers, which are nearly always time-limited, and ask for a complimentary hotel room if your substitute flight isn’t until the next day”