he was distracted and thus omitted to disconnect the autopilot
Omission's definitions:
- a mistake resulting from neglect
- intentional or unintentional failure to act that may impose criminal liability if a duty to act under the circumstances is specified by law.
- a failure to carry out a duty or to fulfill an act.
- the act, fact, or state of leaving something out or failing to do something esp. that is required by duty, procedure, or law
It's quite ambiguous to qualify an act as an omission in the report without further analysis.