Question: What is the sector of the company with an incorporated date before 1983?
SQL: SELECT "Sector" FROM "2-15221362-8" WHERE "Incorporated" < 1983.0;

Question: What is the average incorporataed year of the Air India Charters company?
SQL: SELECT AVG("Incorporated") FROM "2-15221362-8" WHERE "Company" = 'Air India Charters';