The Panama Canal and a Spanish-led construction consortium expanding the major global waterway discussed options to keep the multibillion-dollar project afloat amid a dispute over costs, but any deal seemed unlikely ahead of a looming deadline. The disagreement between the two parties over $1.6 billion in cost-overruns and how to maintain financing has already halted work on the project for two weeks and has delayed its projected completion until at least December 2015. Delays could cost Panama millions of dollars in lost shipping tolls and are a setback for companies worldwide that are eager to move larger ships through the canal, including liquefied natural gas producers that want to ship from the U.S. Gulf Coast to Asian markets.