That Time of The Year 2019 (second edition) came and went and my body is still trying to adjust back to local timing. After the discontinuation of SQ67/68, SQ51/52 is now the longest route for Singapore Airlines. The Houston route was previously flown using a 777-300ER via Moscow (SIN-DME-IAH) but has since changed to an A350-900 (hence eliminating First Class on this route) and the layover stop is now in Manchester.