NEW YORK -- Now that General Motors has christened its large, rear-wheel-drive platform (code-named Omega) with the debut of the Cadillac CT6 sedan, what other cars might go onto that same foundation?

A flagship Buick is one, says GM product chief Mark Reuss. But not right now.

“Not yet,” Reuss answered when asked at the auto show here this month whether an Omega-based Buick was in the cards. “We’re working on that.”

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