But if we're talking dumb on TLV routes, that title goes to Delta (after AA, of course). They managed to not have a flight Sep 26 afternoon (erev R"H), when they had it every other day that week. Every seat on LY and UA was sold out (besides those who land late Fri). And last year, they managed to not have a flight Motzei R"H when they have one every night of the year besides Yom Kippur.
That's almost as bad as PS not scheduling a flight to NY on Tzom Gedalia...