Originally Posted by
xliioper
Different alliances and airlines have different rules and it's not due to a "lazy agent". There's no obligation for free seat assignments with DL Basic fares no matter what you status level or with which airline. About the only status benefit you get on DL Basic fares is the checked luggage benefit. For non-DL STE+ elites, you also still get Sky Club access on international itins (excepting the Caribbean).
Valid, and yes, I do understand the basic economy rules. I said so because maybe...you can try your luck and ask for a specific seat? Idk though - my flight was before Delta added the "can't be changed" clause to Main Basic.