Anchor: Though the advent of air travel negates the need for passengers to take a long sea journey, the Suez Canal is still important for cargo vessels, and watching a leviathan tanker travel sedately through the passage is an unreal experience.
Entailed: Air travel makes a journey by boat unnecessary, but the Suez Canal is still of great import.
Contradiction: It is pretty common place to watch tankers sail through the Suez Canal.  
Contradiction: Air travel never picked up enough to eliminate the need for sea travel.
Contradiction: Harvard University's analysts never managed to finish the report.
Contradiction: You couldn't predict what would happen with taxes.
Contradiction: Fish is unimportant to the diet in Ibiza because it is not located in the Mediterranean.