Answered by ZUPAN | Jun. 19, 2019 09:30
Aaron, I know you are asking this question to John Doe, but I will answer the same because I have answered to your initial question on 72-Hour Visa-Free Transit in China thread. Maybe you didn't notice it there.
Yes, you can fly tomorrow from Laos to Shenzhen and keep in mind that you will have to declare at the check-in that you will be using 144 hours visa free transit in Shenzhen. You will also have to show an e-voucher provided by CKS - Chu Kong Passenger Transportation company for the route between Shenzhen Shekou port and Hong Kong Macau Ferry Terminal in Hong Kong. This ferry ticket is essential because this is the proof that you will be really in transit. Also, as John Doe has already mentioned, the time difference between your scheduled arrival by plane from Laos and your scheduled departure by ferry from Shenzhen to Hong Kong, has to be at least 25 hours.
Upon landing in Shenzhen, you will approach 144 hours visa free transit counter, fill out the blue form and after you show them your ferry ticket and accommodation booking, you will be allowed to leave the airport and stay up to 6 days, i.e. until to departure of the ferry you have bought your ticket for.