I got a call from LX today that LX19 tomorrow on Sep 2 is going to be late 60 min out of EWR. I ask for the reason and they told me that LX18 on Sep 1 is so late that they need delay the flight on Sep 2 to have enough crew rest time. This is what happens when you stretch your long-haul aircrafts what LX is doing since March 2015 and have no spare aircrafts.