A surface structure of a gas turbine engine with an overlapping herringbone filmhole pattern having a first filmrow comprising: a first outward facing portion comprising filmholes oriented to direct cooling air leaving the filmholes outward of a reference edge (E-E') and over a surface of the surface structure; a first inward facing portion comprising filmholes oriented to direct cooling air leaving the filmholes inward toward the reference edge (E-E') and over the surface of the surface structure; a first transition region comprising a first region at least one of equidistant from distal ends, centered relative to mesial ends, or overlapping the mesial ends of the first outward facing portion and the first inward facing portion; and a first transition region filmhole group located in the first transition region, wherein the first transition region filmhole group comprises filmholes oriented to direct cooling air leaving the filmholes at least one of outward relative to the reference edge (E-E') and over the surface of the surface structure or inward relative to the reference edge (E-E') and over the surface of the surface structure; wherein the first outward facing portion is disposed inward of the first inward facing portion; wherein a first outward facing portion group alignment line is defined through a center of each filmhole of the first outward facing portion; wherein a first inward facing portion group alignment line is defined through a center of each filmhole of the first inward facing portion; wherein a first transition region filmhole group alignment line is defined through a center of each filmhole of the first transition region filmhole group; wherein the first inward facing portion group alignment line is parallel to the first outward facing portion group alignment line; and wherein the first transition region filmhole group alignment line is coincident with the first inward facing portion group alignment line and is parallel to the first outward facing portion group alignment line. a first outward facing portion comprising filmholes oriented to direct cooling air leaving the filmholes outward of a reference edge (E-E') and over a surface of the surface structure; a first inward facing portion comprising filmholes oriented to direct cooling air leaving the filmholes inward toward the reference edge (E-E') and over the surface of the surface structure; a first transition region comprising a first region at least one of equidistant from distal ends, centered relative to mesial ends, or overlapping the mesial ends of the first outward facing portion and the first inward facing portion; and a first transition region filmhole group located in the first transition region, wherein the first transition region filmhole group comprises filmholes oriented to direct cooling air leaving the filmholes at least one of outward relative to the reference edge (E-E') and over the surface of the surface structure or inward relative to the reference edge (E-E') and over the surface of the surface structure; wherein the first outward facing portion is disposed inward of the first inward facing portion; wherein a first outward facing portion group alignment line is defined through a center of each filmhole of the first outward facing portion; wherein a first inward facing portion group alignment line is defined through a center of each filmhole of the first inward facing portion; wherein a first transition region filmhole group alignment line is defined through a center of each filmhole of the first transition region filmhole group; wherein the first inward facing portion group alignment line is parallel to the first outward facing portion group alignment line; and wherein the first transition region filmhole group alignment line is coincident with the first inward facing portion group alignment line and is parallel to the first outward facing portion group alignment line.