Slingsby—T-3A Firefly: Mission Profile Configuration options: The T-3 is configured with side-by-side seating for instructor and student, to a combined maximum of 500 lb (227 kg) with ful fuel load Flight screening: The T-3 is employed by AETC to establish at low cost whether an applicant for flying training is suitable. Once through the flight screening process, the lucky applicant will move straight to jets and the T-37B