A combustor for a gas turbine engine includes an annular combustor shell having an inner liner and an outer liner respectively with inner and outer flanges at least partly overlapping to form a dome end portion of the shell, at least the outer flange including intersecting upstream and downstream wall portions defining a corner therebetween, the upstream wall portion having a plurality of cooling apertures defined therethrough immediately upstream of the corner, and the cooling apertures being oriented to direct a cooling air flow from outside the combustor shell therethrough and adjacent an inner surface of the downstream wall portion.