Date: 10 Jan. 1939; Units: VP-9 VP-10; Enroute to Coco Solo from North Island Flt led by Capt Marc Mitscher, ComPatWing ONE 48 A/C - largest grp of A/C to fly 3,000 mi.
This is actually an 18-plane trans-Pac from San Diego to Pearl Harbor on 1938-Jan-18. VP-9 had six PBY-1's (BuNos 0137-0142) and VP-10 had twelve PBY-2's.