Boeing shares recovered 3.9% following a 10.7% post-earnings plunge, with traders eyeing the $169-$171 support area for a potential buy-the-dip.
US Trade Representative Jamieson Greer said a $3.4bn EU loan to Airbus may violate the US-EU aircraft trade truce and sought details.
The FAA certified Boeing's 737 MAX 10 on Tuesday, clearing the way for deliveries of nearly 1,500 jets after a seven-year delay.
Boeing rose about 2.5% after winning a $20bn Navy fighter contract, while Northrop Grumman dropped around 5%.
Boeing is struggling to finalise a 200-jet China deal as expectations for a large order at the Trump-Xi summit fade.