CREATE TABLE table_55212 ("Number & Name" CLOB, "Description" CLOB, "Livery" CLOB, "Owner ( s ) " CLOB, "Date" CLOB)

What owner or owners have an operational description?
SELECT "Owner(s)" FROM table_55212 WHERE "Description" = 'operational'
SELECT "Owner(s)" FROM "table_55212" WHERE "Description" = 'operational'