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… Usable Flight Level is 29.92 inches of mercury or higher FL180 29.91 to 28.92 inches of mercury FL190 28.91 to 27.92 … their estimated passing time; (b) either aircraft is at FL180 or above, both aircraft have reported by the same … aircraft are 2 minutes apart; (c) both aircraft are below FL180 and have reported: (i) by the same NAVAID, (ii) passing …
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