PLT FLYING SKYDIVE ACFT COMPLAINS OF A CLOSE ENCOUNTER BTWN HIS JUMPERS AND A CESSNA TYPE ACFT IN PROX OF TCA; CLASS B AIRSPACE.

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OUR SKYDIVING OP WORKS WITH DFW APCH ON EVERY LOAD; EVEN THOUGH WE ARE OUTSIDE THEIR CTLING AIRSPACE. THIS AIDS IN THEIR VECTORING ARRS OVER OUR AIRSPACE (PERMANENT SKYDIVING NOTAM FILED) WHEN WE ARE NOT DROPPING. THIS PARTICULAR DAY; ATC WAS WORKING THE FLOW FOR N LNDGS; THE OPPOSITE END FROM US. ON EVERY CLB OUT OF 4000 FT I WOULD CALL IN MY DROP ALT; BUT THEY WOULD ONLY TELL ME REMAIN CLR OF CLASS B; INSTEAD OF RADAR CONTACT; ADVISE 1 MIN PRIOR TO DROP. ON THIS PARTICULAR LOAD I DID NOT BOTHER CALLING IN AT 4000 FT; AND CALLED 1 MIN TILL JUMP ON 2 OTHER FREQS. THERE WAS AN UNSEEN CESSNA BELOW THAT CAME IN CLOSE PROX TO THE SKYDIVERS. THIS CESSNA WAS ON FLT FOLLOWING; AND OFF THE AIRWAY. ATC DID NOT NOTIFY ME OF TFC OR NOTIFY THE CESSNA OF DROPPING TFC. THE CESSNA WAS ALSO OFF THE AIRWAY; AND DID NOT CHK FOR NOTAMS ON THEIR RTE. I THINK THAT IF THE CESSNA PLT HAD CHKED NOTAMS AND STAYED ON THE AIRWAY HE WOULD NOT HAVE BEEN A FACTOR. ATC KNEW I WAS CLOSE TO DROP ALT; BUT DID NOT CORRELATE THE 2 PLANES. IF I COULD HAVE SEEN THE PLANE I WOULD HAVE HELD THE JUMPERS.