Northwest Airlines-NWA (subsidiary of Delta Air Lines) (Minneapolis/St. Paul) and Delta Air Lines are cooperating with the federal investigation concerning an incident that occurred yesterday evening (October 21). The flight crew of flight NW 188 from San Diego to Minneapolis/St. Paul overflew its MSP destination by approximately 150 miles! The flight was also reportedly out of radio contact for over one hour. The crew finally realized its mistake and requested ATC permission to turnaround and fly back to MSP. The pilots have been suspended pending the results of the investigation. The crew members were reportedly arguing over pilot and company issues. The aircraft involved was Airbus A320-212 N374NW (msn 1646).