
That's right, we've learned Chesley "Sully" Sullenberger -- the most badass alumni in the history of the Texas school -- is delivering the commencement speech at this year's DHS graduation.
The ceremony, scheduled for June 6, was originally going to feature a giant tribute to Sully -- featuring a billboard of the hero pilot in the middle of town -- but Sully got wind of the grand scheme and humbly shot it down.
We're told Sully's peeps told the school he couldn't "imagine his face on a billboard."
Sully fun fact -- back in the day, he played the flute in the school band ... and you better believe he kicked ass.