A series of aviation accidents has rattled flyers enough to drag down ticket sales at the start of the year, contributing to lower financial expectations at major US airlines. And who can blame them? January’s fiery mid-air collision of an …

A series of aviation accidents has rattled flyers enough to drag down ticket sales at the start of the year, contributing to lower financial expectations at major US airlines. And who can blame them? January’s fiery mid-air collision of an …