On Sunday, December 7th at 11:05am - 11:10am a Bombadier Global business jet moving east to west and a commercial jet travelling north to south crossed paths (observed 5-10 minutes after the actual event)after take off from Phoenix Sky Harbor. I did not see the event but the sound was was very loud. The commercial jet was not travelling on the normal take off pattern and the business jet was on a normal take off pattern. This was not normal and I have never heard anything like it. I did talk to an eye witness, only 6 years old and it scared him. I contacted the airport and local news and no response. Looking for any professional or other comments. I do have info. on the business jet.