Simplify the following text for a Grade 13 native English-speaking person.
Original: After 40 years , the final 737-200 aircraft in the United States flying scheduled passenger service were phased out on March 31 , 2008 with the last flights of Aloha Airlines ( Aloha continues to fly its interisland cargo flights as Aloha Air Cargo ) .
Simplified: After 40 years , the final 737-200 aircraft in the United States flying scheduled passenger service were phased out on March 31 , 2008 with the last flights of Aloha Airlines ( Aloha continues to fly its interisland cargo flights ) .