Enter airfields and build a brief.
Long sorties span hours, so each phase is evaluated at its own time: winds aloft, TAF, AHAS birds, RAIM and airspace are tailored to that phase. Current-only data (live METAR context, PIREPs, SIGMETs) is hidden at far-future phases instead of being implied valid. Out-and-back to the same field is fine — departure and recovery use their own times.