Question: In what time period were 578 built?
SQL: SELECT "Period" FROM "2-12127130-2" WHERE "Built" = '578';

Question: In what time period was the Cessna 208 built?
SQL: SELECT "Period" FROM "2-12127130-2" WHERE "Model" = 'Cessna 208';

Question: In what time period were 354 built?
SQL: SELECT "Period" FROM "2-12127130-2" WHERE "Built" = '354';