Embattled cineplex operator AMC Entertainment (NYSE:AMC) may be mulling over a debt extension proposal. According to inside sources familiar with the matter, such a move would push back the company’s near-term debt maturities. Even without the liabilities overhang, AMC stock suffers from broader industry-wide demand erosion.According to a Bloomberg report, a lender group to the movie theater operator forwarded the aforementioned debt payment extension proposal. As of Dec. 31 of last year, AMC owes approxima ...