Updated at 11:45 a.m. with information from union spokesman Thomas Pinski.
Updated at 12 p.m. with statement from the White House.
Updated at 1:20 p.m. with comments from union president Gordon King and statement from Boeing.
The Obama administration has approved the sale of $30 billion worth of F-15 fighter jets to Saudi Arabia - a move that could mean new jobs at Boeing's defense plant in Hazelwood.
St. Louis Public Radio is a service of the University of Missouri-St. Louis.