I booked my flight back to the US from Beijing

but originally it said it was from Beijing to LAX, or so I thought. Then my flight was changed and now I fly from Beijing to Chengdu to LAX. THEN...my flight was changed again to Beijing to Chengdu for 16 hours then LAX. Originally I had planned to go to Beijing a day or two early to visit the great wall and a couple of other spots but I was under the impression that I'd be able to get the 72 hour visa but now I am not sure that I can get it at all. Does anyone know? By the looks of the picture it seems like I can no longer get the 72 hour free transit in Beijing :(