Flying on CX to HKG via SFO next month. The flight to SFO leaves around 8pm, but I need a positioning flight from DFW first. Since there a several flights a day on the route I was thinking of flying up on the 788 that arrives around 2:30pm. One reason is I like flying on dreamliners. The other reason (and this is where I need some advice) they are less likely to delay the flight? In my head I'm thinking they need the 788 for a later international flight? I realize this isn't really sound reasoning, but flying in the night before incurs several hundred more dollars for a hotel. Should I pick an earlier flight or even the night before? ORD in summer can have storms etc. so I'm more concerned about connections there than say flying into LAX.
Any advice is appreciated!