The best-selling Boeing aircraft has been involved in two fatal crashes Most airlines flying their 737 MAX aircraft have grounded their fleet WASHINGTON: US President Donald Trump on Monday offered Boeing Co. advice in the wake of two fatal crashes involving its 737 MAX jetliner, saying the planemaker should “rebrand” the best-selling aircraft after fixing it.“What do I know about branding, maybe nothing (but I did become President!), but if I were Boeing, I would FIX the Boeing 737 MAX, add some additional great features, & REBRAND the plane with a new name. No product has suffered like this one. But again, what the hell do I know?” Trump tweeted.