To be able to post in #real-world-aviation you need to be TL2.
There is a natural progression for participants in any community. Your current trust level is visible on your user page, and a summary of all trust levels within your community is presented on your dashboard. Promotions automatically occur as well as auto demotions due to lack of activity. Staff/Moderators reserve the right to lock a user to a specific trust level based on behaviour.
New User (TL-0)
All new users start out at trust level 0. These are visitors who just created an account and are still learning the way your community works. New users’ abilities are restricted. As a new user, you cannot send private messages to other users or flag posts. Your first few posts will need to be approved before they show up on the forum.
Basic User (TL-1)
If a new user is willing to spend a little time reading, posting, and liking, they will quickly be promoted to the first trust level. TL1 users can flag posts and send private messages (PM).
Member User (TL-2)
Once reaching TL2, you may now post feature requests as well as participate in other restricted categories. Additionally, TL2 users have an increased number of daily likes available. Moderators cannot see how close you are to achieving TL2.
Regular User (TL-3)
Regulars are the backbone of the IF community, the most active readers and reliable contributors over a period of months, even years. Because they’re always around, they can be further trusted to help tidy up and organize the community. Regulars can recategorize and rename topics.
If you dip below the requirements in the last 100 days, you will be demoted back to Member. The requirements are not documented and have been changed from the discourse defaults. This is to encourage active participation.