LINCOLN, Neb. (AP) – Duncan Aviation says it’s restoring wages and adding jobs, but it hasn’t restored all the employment lost to the sharp decline in corporate flights.  The Lincoln-based company provides aircraft maintenance in more than a dozen states.  Duncan had about 2,200 employees, including1,400 in Lincoln, in January 2009, when it announced it was cutting pay for all employees to prevent layoffs.  In March 2009, the company cut more than 300 jobs, including 170 in Lincoln.  The Lincoln Journal Star says Thursday that Duncan announced this week that it will be restoring full wages.  Company PresidentAaron Hilkemann says demand for its services has improved as the business aviation industry recovers.  Hilkemann says Duncan will continue to hire additional workers throughout 2011.