Now that the LOA is in effect at United, their regionals will see flying reduced from 120% mainline NB block using a rolling 12 month average to a month to month reduction of less than 100% of mainline NB block hours. Prior to COVID, the scope restrictions on the 70/76 seaters kept the regional flying below the 100% mark when mainline was flying a full schedule. In the last few months, regional block hours have far exceeded the 120% limit on a month to month basis, while still in compliance with the 12 month look back. Now, for the duration of the LOA, the regional block hours will have to be reduced, mainline NB block hours increased, or some combination that will keep regional block hours below mainline NB block.