Throughout most of the war, the 303rd BG flew missions in a "BOX" formation composed of  4 groups of 3 or 4 planes. This BOX formation is described at the 303rdbga web page.  A typical pre-mission briefing sheet showing the box type of formation is shown on my web page below.
   On or about the beginning of April of 1945, the 303rd switched to what I describe as a "6-wide double V" formation.  A typical mission sheet is also shown on this page.
    Recently, I found a great photo taken on the Apr 16 1945 mission to Staubing (lead by Major Heller, and Wm Jones flying deputy lead).  The picture was apparently taken from AC#43-39453 (PU-D) flown by 1Lt Jack Breslin, who flew at the head of the second "V". Immediately behind PU-D, is seen PU-Q, ie AC#44-6516 (My Darling) flown by 1Lt Gordon Wirth.
      Further behind PU-Q, you can see the entire 427th "LOW" squadron, lead by Donald Hewitt.  This view clearly shows the orientation of the planes in this double V formation.  Image shown below: