I wouldn’t normally think it’s a big deal to mix up two similar-sounding cities— once I got on a flight to Greenville and the flight attendant got on the speaker and said “welcome to flight [xxx] to Greensboro,” causing momentary panic— but this is part of a pattern. He recently has said he beat Obama in an election, that Jeb Bush was president, that Biden could get us into World War II, and several more. Taken in isolation any of these things could be dismissed as a slip of the tongue but taken all together, it does suggest the guy might be losing his grip.