Complete the sentence about Sofia Airport with the correct year: From June through September ______, Yugoslav airline Aeroput connected Sofia with Belgrade thrice weekly using Lockheed Model 10 Electra planes.

Answer and explanation

Correct answer: C. 1938

From June to September 1938 the Yugoslav airline Aeroput linked Sofia with Belgrade three times a week using Lockheed aircraft. The airfield by then had a paved runway.

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