EXCERPT:

FORTUNE — Hopefully viewers of Mad Men have calmed down from the rollercoaster of Sunday’s season finale by now. While the big questions will keep us in suspense for season five, Fortune has your answers on the brands of the last episodes. (Catch up with our highlights of the first three seasons’ brands in Mad Men is back, and so is product placement, and the earlier episodes from this season in Mountain Dew and Mad Men: The stories behind the pitches.)

Episode 10: North American Aviation, Lucky Strike

Season four featured personal disaster, with Draper hitting rock bottom as he struggles with his past and the inability to overcome his past and find stability. In Episode 10, the storm engulfing Don’s personal life washes out what should be a great step forward for Sterling Cooper Draper Pryce. The firm lands a $4 million account with North American Aviation to promote its technology in aeronautics and defense. In a moment of triumph for Pete, Draper has to pull the plug to protect his own skin from the Feds.

In a move disastrous for SCDP, the fictional character Lee Garner Jr. also drops the bomb on Roger Sterling that Lucky Strike is moving to join the other American Tobacco brands at another agency.

North American Aviation may have been a giant of the 1960’s, but by 1967 it had merged into Rockwell International, which was acquired by Boeing (BAFortune 500) in 1996. For its part, Boeing seems to enjoy its connection to its predecessor. The company’s brand management office was buzzing about the Mad Men appearance, of which they had no prior knowledge. A brand spokesman says that since NAA seems unlikely to return to the show, they would not reach out to AMC, but would be happy to provide “heritage” materials if asked in the future. In the meantime, Boeing sells NAA merchandise in its stores and online, and hopes to connect to the Mad Men reference on its Facebook page.

As Fortune has noted, Lucky Strike as a Garner family operation was a Mad Men invention that has provided the show with important material throughout its run. In this episode, we hear mention of Lucky Strike’s new role as a piece of the American Tobacco Company, the real and one-time owner of “The Lucky Strike Company,” which is now a subsidiary that has bounced around in ownership over the years.

FOR THE OTHER BRANDS OF THE FINAL WEEKS OF MAD MEN, SEE:

Brands of Mad Men: Cigarettes and cancer