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Operations Specifications (OPSPECS) are the specifications that the FAA assigns to airlines for such things as authorized routes, types of equipment, VFR and IFR operations, and alternate requirements. OPS Spec C055 discusses the requirement for alternate airports. From https://blog.airployment.com/common-121-takeoff-minimums-and-takeoff-alternate-questions/: One area that  is sometimes difficult for new Part 121 pilots to comprehend is the exclusivity of takeoff minimums from landing minimums. Try to picture each as completely separate from the other. Just because a particular airport is below landing minimums doesn’t (necessarily) mean you can’t depart. Instead, first attempt to consider the takeoff minimums by themselves. If the weather, airport equipment, aircraft capabilities, and FARs/Ops Specs will permit such a takeoff, nothing prevents you from departing. Only after you’ve examined the feasibility of a takeoff should you look at the landing minimums. What if the airport is below landing mins? Then y