Question: When was the aircraft introduced that could seat 115 people?
SQL: SELECT AVG("Introduced") FROM "2-180466-4" WHERE "Seating" = '115';

Question: What year was the aircraft retired when it was Replaced by 737-300s?
SQL: SELECT "Retired" FROM "2-180466-4" WHERE "Notes" = 'Replaced by 737-300s';

Question: What aircraft was introduced in 2004 and has a retired of —?
SQL: SELECT "Aircraft" FROM "2-180466-4" WHERE "Retired" = '—' AND "Introduced" = 2004.0;

Question: Which aircraft has 148/9 seating?
SQL: SELECT "Aircraft" FROM "2-180466-4" WHERE "Seating" = '148/9';

Question: How many people can be seated on the aircraft that was introduced in 2008 and has notes of In service?
SQL: SELECT "Seating" FROM "2-180466-4" WHERE "Notes" = 'In service' AND "Introduced" = 2008.0;