Online check-in LongJiang Airlines - https://www.check-in.site

LongJiang Airlines is a fictional airline, and there is no real-world information available about it. As an AI language model, I don't have access to current or future events beyond my knowledge cutoff in September 2021. Therefore, I cannot provide specific details or updates about LongJiang Airlines as of May 2023. If LongJiang Airlines is a newly established airline or a local airline, it's possible that there is limited information available about it. If you have any specific questions or if there's another topic I can assist you with, please let me know!