As mentioned before, the Staff don’t give specific release dates. They do try and keep us informed and updated when there is things they feel need to be communicated. Always be on the look out in Announcements Blog and the IF social media accounts.
Check this post out for the latest info about the next update: https://community.infiniteflight.com/t/open-beta-progress-for-january-30/1145794/211
and this for info on the aircraft: New Content Pipeline - #47 by DanilVL