If you have received the iOS hotfix in the App Store, don’t download just yet. If you have already downloaded the hotfix and have aircraft that are missing, this is an issue that has been fixed and resubmitted to Apple. It should be available in the App Store very soon.
Another is being sent through an expedited review. If you’re an android user your update is okay to download. Those aircraft are not lost forever!
Thanks for your patience and understanding.