Supply: Thinking Like a Seller End of Chapter Problem Boeing is a producer of widebody aircraft. a. The manufacturing plant used to produce aircraft is a cost for Boeing. The cost of the manufacturing plant be included in the opportunity cost of producing an additional aircraft. b. The labor used to produce the aircraft is a cost for Boeing. Labor costs be included in the opportunity cost of producing an additional aircraft. c. The cost of the seats that are installed in each aircraft is a cost for Boeing. The cost of the seats be included in the opportunity cost of producing an additional aircraft