(Bloomberg) -- Boeing Co. received sign off for the 737 Max 7 from the Federal Aviation Administration, ending a drawn-out certification process that was upended by two fatal crashes and quality lapses at the US planemaker. The Max 7 has been predominantly ordered by Southwest Airlines Co. and Boeing has 282 unfilled orders for the Max 7, according to its website. In a separate statement, Boeing said it was working with Southwest Airlines to prepare for the delivery of the first Max 7. Boeing has said it expected to win sign-off for the Max 7 and the still-uncertified Max 10 variants this year. (Updates with details from Boeing statement beginning in fourth paragraph.)