Yes, it doubles at 6 days and under, but my point is, it's neither 14 days nor 21 days for pre purchase, and no round trip is required. The "old" thinking about

Yes, it doubles at 6 days and under, but my point is, it's neither 14 days nor 21 days for pre purchase, and no round trip is required. The "old" thinking about fares is no longer valid.