OK, more examples:

The following flights have Alaska Airlines (AS) flight numbers, but are code-shares actually operated by American Airlines.

AS/AA code-shares:
DFW - LAX, ORD, PDX, SEA, SFO.

ORD - ATL, AUS, AZO, BDL, BNA, BOS, BUF, BWI, CID, CLE, CMH, CMI, CVG, DAY, DCA, DFW, DSM, DTW, ELP, EVV, EWR, FWA, GRB, GRR, HPN, IAD, IAH, IND, LAX, LGA, LSE, MCI, MCO, MDT, MIA, MKE, MSN, MSP, MSY, OMA, ORD, PDX, PHL, PIA, PIT, RDU, RIC, ROC, RST, SAT, SFO, SWF, SYR, TOL, TUL, TVC, XNA, YUL, YYZ.

MIA - ORD, SEA, SFO

So, I guess my question is: could I book a ticket from MIA/SEA via the AS website, provide my OnePass number and actually get CO miles & credit for Elite, by actually flying on AA metal?

As for why I would want to do this I haven't figured out, this is just an idea at this point.