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When you override 2:30 + 1 with 3:15, you are telling the system that the flight arrives on the same day of the week as it departs. Since the flight crosses midnight, the system interprets this override as arriving on the day one week later than it departed, hence the +7. (-7 shouldn't occur, so I'll take a look for that issue.
Does an override ETA of 3:15 + 1 work?
Don