1. Decision Analysis Imitation feasibility of auctioning alternative

2. Auctioning for the smoking right Economic criteria—additional revenue benefit to the airline minus the installation cost of special cabin Legal criteria—infeasible under the flight regulation or the health related lawsuit Practical criteria—difficult to quarantine the smoke spreading absolutely in the flight cabin (non-exclusive externality) Ethical criteria—the dirty smoke mist as the poisonous gas to the lungs

3. Auctioning for the landing priority Economic criteria—discrimination pricing benefit to the airport; the potential catastrophe after the air traffic jamming Legal criteria—(in-)feasible under the flight regulation? the discretion of air traffic controller Practical criteria—resulting in too many emergency landing; to induce the fuel-wasting hover and unnecessary going around Ethical criteria—the safety of flight passengers; the most dangerous timing of flight occurs at taking off and landing