Airlines find the grass isn't always greener with new engines

Technicians work on an engine at GE Aerospace's engine shop in Lafayette, Indiana. Leslie Josephs/CNBC RIO DE JANEIRO — Airplane engine makers have fallen short of what they promised airlines, major carriers' CEOs say, a problem vexing an industry that has struggled for years with aircraft shortages and more recently, a doubling of fuel prices. It's a paradox: Engine makers dazzled carriers with more fuel-efficient options for new planes from Boeing and Airbus. …