some of the anti-buttigieg transportation complaints are pretty transparent and dumb but the faa issue is clearly within his purview and it's a legit complaint, even if causes obviously predated his arrival.
more importantly, afaik, he's done nothing to address america's out of this world cost issues with infrastructure construction. anyone looking to build a case for him as a highly efficient and effective bureaucrat is (so far) not getting much of a case from his time at transportation.