CREATE TABLE flight (id DECIMAL, vehicle_flight_number TEXT, date TEXT, pilot TEXT, velocity DECIMAL, altitude DECIMAL, airport_id DECIMAL, company_id DECIMAL)
CREATE TABLE airport (id DECIMAL, city TEXT, country TEXT, iata TEXT, icao TEXT, name TEXT)
CREATE TABLE operate_company (id DECIMAL, name TEXT, type TEXT, principal_activities TEXT, incorporated_in TEXT, group_equity_shareholding DECIMAL)

What is the most common company type, and how many are there?
SELECT type, COUNT(*) FROM operate_company GROUP BY type ORDER BY COUNT(*) DESC LIMIT 1
SELECT "type", COUNT(*) FROM "operate_company" GROUP BY "type" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1