Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Other / Unknown
Conflict Ground Conflict; Critical
Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Human Factors
Before starting out at ZZZ; an advisory radio call was made at XA41; stating we would be taxing to RWY XX from the terminal. Weather conditions were VMC; winds at 34004; CLR and 10sm visibility. Throughout our taxi from the terminal to the hold short line of RWY XX; no radio calls from any other aircrafts were heard by us. Before entering RWY XX; a second advisory call was made to state our intentions. No replies were heard again. A third advisory call was made at XA50CDT stating we would be taking off from RWY XX. Again; no replies or acknowledgments were heard. Right before we cross the intersection of RWY XX and XY; an airborne aircraft; Aircraft Y; crossed our departure path at 100 ft. above us and departing from RWY XY; simultaneously as we departed RWY XX. No radio monitoring or calls made by Aircraft Y pilot; before entering the airport movement area and departing the RWY XY.
C-402C Captain reported an NMAC event on takeoff caused by a nonreporting aircraft departing cross runway.