Modern aircraft have engineering tolerances that are absolutely absurd: http://www.popularmechanics.com/flight/g2428/7-airplane-wing-stress-tests/ http://www.po

Modern aircraft have engineering tolerances that are absolutely absurd: http://www.popularmechanics.com/flight/g2428/7-airplane-wing-stress-tests/ http://www.popularmechanics.com/flight/g2428/7-airplane-wing... The shake and wobble in wings is by design. If they didn't flex they'd shatter.