Narrative:

During takeoff at rotate speed, I was the PF and noticed commuter aircraft landing to the north and under us. I rotated more aggressively than standard to help avoid possible conflict. Good crew coordination in our cockpit as to situational awareness. Tower never notified us of commuter traffic. My opinion, had commuter done a go around, neither aircraft would've had any place to go to avoid a midair collision. Poor judgement on phl tower's part for putting either aircraft in the position we found ourselves. We at least should've been notified upon takeoff clearance of potential traffic hazard.

Related reports:

Google
 

Original NASA ASRS Text

Title: DC9 AND DH8 HAD NMAC AT PHL. DURING RESPECTIVE TKOF AND ARR ON INTERSECTING RWYS.

Narrative: DURING TKOF AT ROTATE SPD, I WAS THE PF AND NOTICED COMMUTER ACFT LNDG TO THE N AND UNDER US. I ROTATED MORE AGGRESSIVELY THAN STANDARD TO HELP AVOID POSSIBLE CONFLICT. GOOD CREW COORD IN OUR COCKPIT AS TO SITUATIONAL AWARENESS. TWR NEVER NOTIFIED US OF COMMUTER TFC. MY OPINION, HAD COMMUTER DONE A GAR, NEITHER ACFT WOULD'VE HAD ANY PLACE TO GO TO AVOID A MIDAIR COLLISION. POOR JUDGEMENT ON PHL TWR'S PART FOR PUTTING EITHER ACFT IN THE POS WE FOUND OURSELVES. WE AT LEAST SHOULD'VE BEEN NOTIFIED UPON TKOF CLRNC OF POTENTIAL TFC HAZARD.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.