<p class="title">US aviation regulators criticized Boeing on Friday for not immediately disclosing communications between two employees with "concerning" information on the investigation of the 737 MAX.</p>.<p class="bodytext">The Federal Aviation Administration said Boeing discovered instant messages between the employees "some months ago" but did not disclose their existence until Thursday.</p>.<p class="bodytext">The FAA said it flagged its concerns to lawmakers on Capitol Hill and the Department of Transportation's inspector general.</p>.<p class="bodytext">The MAX has been grounded since mid-March following two crashes that killed 346 people.</p>.<p class="bodytext">The messages are between the employees and characterize communications with the FAA during the original certification of the MAX in 2016, the FAA said.</p>.<p class="bodytext">"Last night, I reviewed a concerning document that Boeing provided late yesterday to the Department of Transportation," FAA Administrator Steve Dickson said a letter to Boeing chief Dennis Muilenburg.</p>.<p class="bodytext">"I understand that Boeing discovered the document in its files months ago. I expect your explanation immediately regarding the content of this document and Boeing's delay in disclosing the document to its safety regulator."</p>.<p class="bodytext">Boeing did not have an immediate comment.</p>.<p class="bodytext">News of the messages come as the FAA has taken the lead among international regulators in overseeing the recertification for the MAX in a process that has dragged out much longer than originally expected.</p>.<p class="bodytext">Shares of Boeing tumbled 3.7 percent to USD 355.35 in early afternoon trading.</p>
<p class="title">US aviation regulators criticized Boeing on Friday for not immediately disclosing communications between two employees with "concerning" information on the investigation of the 737 MAX.</p>.<p class="bodytext">The Federal Aviation Administration said Boeing discovered instant messages between the employees "some months ago" but did not disclose their existence until Thursday.</p>.<p class="bodytext">The FAA said it flagged its concerns to lawmakers on Capitol Hill and the Department of Transportation's inspector general.</p>.<p class="bodytext">The MAX has been grounded since mid-March following two crashes that killed 346 people.</p>.<p class="bodytext">The messages are between the employees and characterize communications with the FAA during the original certification of the MAX in 2016, the FAA said.</p>.<p class="bodytext">"Last night, I reviewed a concerning document that Boeing provided late yesterday to the Department of Transportation," FAA Administrator Steve Dickson said a letter to Boeing chief Dennis Muilenburg.</p>.<p class="bodytext">"I understand that Boeing discovered the document in its files months ago. I expect your explanation immediately regarding the content of this document and Boeing's delay in disclosing the document to its safety regulator."</p>.<p class="bodytext">Boeing did not have an immediate comment.</p>.<p class="bodytext">News of the messages come as the FAA has taken the lead among international regulators in overseeing the recertification for the MAX in a process that has dragged out much longer than originally expected.</p>.<p class="bodytext">Shares of Boeing tumbled 3.7 percent to USD 355.35 in early afternoon trading.</p>