CREATE TABLE table_60830 ("Aircraft" CLOB, "Introduced" FLOAT, "Retired" CLOB, "Seating" CLOB, "Notes" CLOB)

When was the aircraft introduced that could seat 115 people?
SELECT AVG("Introduced") FROM table_60830 WHERE "Seating" = '115'
SELECT AVG("Introduced") FROM "table_60830" WHERE "Seating" = '115'