Received a LUV voucher for $100 a few days ago because of a delayed flight. Tried to use it this morning when booking another flight but the voucher was not used. The entire cost was charged to my credit card. One thing I noticed. It asked me for a security code. My voucher has a voucher number and a 4-digit confirmation. I assumed the confirmation number was the security code. Why was my voucher not used to pay for part of the cost?
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