Question: How many items shipped by REG AIR were ordered on March 22, 1995?
SQL: SELECT COUNT(T1.o_orderkey) FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey WHERE T2.l_shipmode = 'REG AIR' AND T1.o_orderdate = '1995-03-22'