The PBGC now has a 20.7% stake in Delta Air Lines Inc. Atlanta, following terms of a reorganization plan for holders of unsecured claims against the company, according to an SEC filing Monday. The PBGC received the stake for taking over the underfunded pilots plan as part of Deltas Chapter 11 bankruptcy reorganization. Under the reorganization plan holders of unsecured claims are allowed to receive shares of Delta stock, and the PBGC is expected to receive additional Delta shares in the future, according to the filing. The PBGC took over Deltas $1.6 billion pension plan for pilots in January; it was frozen in July 2005. The plan was underfunded by about $3 billion.