WASHINGTON, Aug 5 (Reuters) - The National

Transportation Safety Board said a number of Boeing ( BA ) and Spirit

AeroSystems ( SPR ) executives will testify at a two-day hearing

starting Tuesday on the January Alaska Airlines Boeing

737 MAX 9 in-flight door plug emergency.

Boeing's ( BA ) senior vice president for quality Elizabeth Lund

and Doug Ackerman, vice president of supplier quality for Boeing ( BA )

are among those that will testify as will Terry George, senior

vice president and general manager for Boeing Program at Spirit

AeroSystems ( SPR ), the NTSB said. Several Federal Aviation

Administration officials will also testify.