DALLAS (AP) — Southwest Airlines says hundreds of flights have been delayed by technical issues that are forcing it to check in some customers manually at airports and are causing long lines. E.J. Schultz, a reporter for Ad Age who was taking a Southwest flight from Chicago's Midway Airport, said the airline was telling people at the gate that travelers with paper boarding passes were fine. Emily Mitnick, who was flying to Detroit from Denver International Airport, said she missed her 10 a.m.