Write a question about the following article: Colombia has well-developed air routes and an estimated total of 984 airports, 100 of which have paved runways, plus two heliports. Of the 74 main airports, 20 can accommodate jet aircraft. Two airports are more than 3,047 meters in length, nine are 2,438–3,047 meters, 39 are 1,524–2,437 meters, 38 are 914–1,523 meters, 12 are shorter than 914 meters, and 880 have unpaved runways. The government has been selling its stake in local airports in order to allow their privatization. The country has 40 regional airports, and the cities of Bogotá, Medellín, Cali, Barranquilla, Bucaramanga, Cartagena, Cúcuta, Leticia, Pereira, San Andrés, and Santa Marta have international airports. Bogotás El Dorado International Airport handles 550 million metric tons of cargo and 22 million passengers a year, making it the largest airport in Latin America in terms of cargo and the third largest in passenger numbers.

Question about the article:
How many of the 74 main airports cannot accommodate jet aircraft?