Alaska Air Group Inc. ALK, -0.03%, which was at the heart of the issues surrounding the grounding of Boeing Co.’s BA, +1.24% 737 Max 9 planes, said Thursday it was “preparing to complete” the final inspections of all of those planes in its fleet. Regarding the Boeing 737-900ER model planes, which the Federal Aviation Administration said should also be “visually” inspected, Alaska Air said it has completed inspections of all those aircraft it has, “with only one minor finding which was immediately corrected ...