I'm looking to book a RTW and I've noticed that BA seems to have no D class availability on any long haul flights I've checked. Plenty of D class on other oneworld flights with the same city pairs whether codeshared or operated by the airlines. Seems very suspicious. Can it be that everyone is booking BA or have they severely restricted the inventory of D class...

Is this just me or has anyone else noticed this?

(I prefer to book BA where possible to get my 4 BA qualifying segments)