Delta Air Lines Inc., the $15 billion Atlanta-based airline, rehired Edward Bastian as its CFO and executive vice president. He replaces Michael Palumbo, who left to pursue other interests. Bastian, 48, had been CFO and senior vice president of Acuity Brands Inc. since June. Before leaving Delta to join Acuity, Bastian was Delta’s senior vice president of finance and controller. He joined the airline in 1998 as vice president of finance, after serving as vice president of business process re-engineering for Frito Lay Inc., a subsidiary of Pepsico Inc. Delta also rehired Paul Jacobson as treasurer and vice president. He replaces Todd Helvie, who left the company. Jacobson, 33, had been assistant treasurer at Mirant Corp. since March, after having served as Delta’s assistant treasurer.