Is this a red flag?

Hi guys! A man I'm dating for 5 months who is a commercial pilot flew me to meet his daughter and mother on the airline he works for. During the trip I remember thanking him for dinners and making me comfortable. When we got back, he said he wanted to tell me something. He pointed out that I never thanked him for paying for the flight. I felt so ashamed because I didn't think I missed thanking him for anything. I apologized but I guess I wasn't sure if he got points to pay for the flight. It just feels unsettling.. Thoughts? Men, would you say anything if this was your situation?

Is this a red flag?
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