Multiple flights have faced disruptions due to communication issues and false alarms regarding cockpit security. An American Airlines flight bound for Los Angeles had to return to Omaha after pilots believed someone was attempting to breach the cockpit, prompting a false alarm. In a separate incident, a SkyWest flight returning to LAX was diverted back to Nebraska after an interphone malfunction caused confusion among the crew. These incidents highlight ongoing concerns about cockpit security and communication protocols in the aviation industry.