Abstract: For analyzing pairing reliability is disclosed, an apparatus, a method, and a computer program product are disclosed. The apparatus may include a pairing schedule module that receives a crew pairing and a history module that retrieves historical performance data for at least one connectable leg in the crew pairing. The crew pairing includes two or more connectable legs. The apparatus, in some embodiments, includes a limitation module that identifies one or more operation limitations applicable to the crew pairing and a reliability module that calculates a reliability factor for the crew pairing based on the historical performance data. The reliability factor indicates a probability that the crew pairing will comply with the one or more operation limitations.