An imbalance of supply and demand in the airline industry is pushing this stock higher.FTAI Aviation (FTAI 0.49%) is a rapidly expanding aircraft maintenance, repair, and leasing company that most investors have never heard of.The New York City-based company has two main divisions. One owns and leases assets including aircraft and engines. The other manufactures, refurbishes, and repairs aircraft engines and other components. The company specializes in two particular engines: the CFM56, the best-selling com ...