Anchor: Because air space is limited, there's an inclination to believe that airlines are natural monopolies or oligopolies and that flooding the market with competitors will actually make air travel less, not more, efficient.
Entailed: Some believe increasing the number of competitors might make air travel less efficient. 
Contradiction: Air space is unlimited so it is widely believed that more competitors will make air travel more efficient. 
Contradiction: Boston after midnight.
Contradiction: Exhibit 13 provides a summery of benefits of Clear Skies Act.
Contradiction: Children are looking into a shop window.
Contradiction: There are two kids .