Two Northwest Airlines pilots who flew 150 miles past their destination because they were focused on laptop computers instead of cockpit displays may have opened a new avenue of concern for safety regulators — distracting personal electronic devices on the flight deck. The pilots of Northwest flight 188 told the National Transportation Safety Board that they were so engrossed in a complicated new crew-scheduling program on their laptops that they lost track of time and place for more than an hour until they were reached by a flight attendant on an intercom.