Conversation so far:
When did Chesley Sullenberger start his civil aviation career?
Chesley Sullenberger was employed by US Airways and its predecessor airlines from 1980 until 2010.
What was notable about Chesley Sullenberger's civil aviation career?
Chesley Sullenberger holds an airline transport pilot certificate for single and multi-engine airplanes, a commercial pilot license rating in gliders, and a flight instructor certificate for airplanes and gliders.

Question: What did he accomplish?
Self-contained rewrite: What did Chesley Sullenberger accomplish with his civil aviation career?