make seats more adjustable
 

I flew the pacific and return on a V australia 777, syd to lax and back
the basic economy seat on the way out was much more comfortable for me than the more expensive premium economy seat on the way back

on the prem economy seat, the seat cushion was too flat so I kept sliding forward, the cheaper seat held me well so I could sleep comfortably

the front of the prem economy seat cushion lifted up slightly but I couldnt find anything to jam under it

since seat backrests can be adjusted, why not make the angle of the seat cushion adjustable, especially on the more expensive seats, for me prem economy was disapointing
was nice to be on a new plane, but the all grey interior was like a funeral parlor, it was surprisingly noisy, and I noted noise cancelling headphones provided.
the toilets were excellent, plenty of space and a very good air evacuation system