Investigators have completed their inspections of Southwest's affected Boeing 737-300s following Friday's incident in which a fuselage crack opened up in mid-flight. On Monday, inspections forced the cancellation of 70 out of roughly 3,400 scheduled flights. Southwest grounded 79 of its oldest 737s after Friday's incident to conduct thorough inspections that went beyond guidelines issued by the planes' manufacturer. "We continue to monitor the in-service fleet, and no fleetwide action has been identified," Boeing said in a statement. "If the investigation determines a need to communicate to the fleet, we will take appropriate action."