I'll go with Denny Dingle Dangle Crane on this one.
1.B.6. “Alaska hub” means SEA, ANC, LAX and any other airport having a monthly average of 37 at least 100 Alaska scheduled flight departures per day.
1.B.23. “Delta hub” means ATL, CVG, DTW, JFK, LAX, SLC, LGA, MEM, MSP, DTW, MEM, SLC, and any other airport having a monthly average of at least 100 Delta scheduled flight departures per day.
Exception: SEA is not a Delta hub, regardless of the number of scheduled flight departures.
1.O.2. The DL code will not be placed on AS flight segments between Delta hubs whether or not a Delta hub is also an Alaska hub.
1.O.3. The DL code will not be placed on AS flight segments to or from a Delta hub.
Exception one: The DL code may be placed on AS flight segments to or from LAX, subject to Section 1 O. 2. Any such flight segments between LAX and an Alaska hub will be included in the calculations in Section 1 O.3.
Exception two: The DL code may be placed on AS hub to hub flight segments, provided that the following limitations are satisfied (measured at the end of each month on a rolling 12 month average):
a. the ratio of the aggregate number of scheduled hub to hub flight segments of DL bearing an AS code, to the aggregate number of scheduled hub to hub flight segments of AS bearing a DL code, must equal or exceed 4.0, and
b. the ratio of the aggregate number of scheduled hub to hub flight segments of Delta bearing an AS code, to the aggregate number of scheduled hub to hub flight segments of Alaska bearing a DL code, must equal or exceed 4.0.
Note one: AS flight segments between SEA and LAX will not be used in calculating the ratios in Section 1 O. 3. Exception two a. and b.
Note two: Each requirement in Section 1 O. 3. Exception two a. and b. will be satisfied if, with respect to such requirement, the number of scheduled flight segments of Delta or DL, as applicable, bearing the AS code, as applicable, is no more than two average daily scheduled flight segments below the minimum number of such flight segments specified by such requirement. It is understood that “average daily scheduled flight segments” will be computed with respect to the applicable rolling time period.