DC-X
DC-X stands for Delta Clipper Experimental (spacecraft)
DC6
DC6 stands for Douglas DC6 (airliner; McDonnell Douglas)
DC85
DC85 stands for Douglas DC-8-50 (airliner; McDonnell Douglas)
DC9
DC9 stands for Douglas DC-9 (airliner; McDonnell Douglas)
DC87
DC87 stands for Douglas DC-8-72 (airliner; McDonnell Douglas)
DC93
DC93 stands for Douglas DC-9-30 (airliner; McDonnell Douglas)
DC91
DC91 stands for Douglas DC-9-10 (airliner; McDonnell Douglas)
DC92
DC92 stands for Douglas DC-9-20 (airliner; McDonnell Douglas)
DC95
DC95 stands for Douglas DC-9-50 (airliner; McDonnell Douglas)
DC94
DC94 stands for Douglas DC-9-40 (airliner; McDonnell Douglas)