CREATE TABLE table_24575 ("Train No." TEXT, "Train Name" TEXT, "Destination" TEXT, "Category" TEXT, "Frequency" TEXT)

How many destinations have a weekly frequency and are named AC Express?
SELECT COUNT("Destination") FROM table_24575 WHERE "Frequency" = 'Weekly' AND "Train Name" = 'AC Express'
SELECT COUNT("Destination") FROM "table_24575" WHERE "Frequency" = 'Weekly' AND "Train Name" = 'AC Express'