The appointment Monday of James Dimon to the helm of Bank One Corp. may well mean that the company will hold on to WingspanBank.com, its Internet-only bank, instead of selling it.

Just last week Bank One was shopping Wingspan to potential buyers, having hired Morgan Stanley Dean Witter & Co. to handle the deal. But Mr. Dimon is enthusiastic about Wingspan, and some observers are speculating that Bank One could keep the unit or fold it into its own main Internet service, bankone.com.

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