0001026608-06-000061 DEF 14A 1 20060531 20060427 20060427 20060427 AAON INC 0000824142 3585 870448736 NV 1231 DEF 14A 34 000-18953 06785337 2425 SOUTH YUKON TULSA OK 74107 9185832266 2425 SOUTH YUKON TULSA OK 74107 DIAMOND HEAD RESOURCES INC 19900808 DEF 14A 1 aaon_def14a06.txt DEF 14A