There was a bug introduced in the v5.3 hotfix which caused airport lighting to remain on during the day. The hotfix has been updated with this fix. If you already downloaded the hotfix only a client update is required to fix this issue. The original hotfix version is 126.96.36.199130, the updated version with the airport lighting fix is 188.8.131.52131. The hotfix post has been updated to reflect the new version and this is also the current version available in the downloads page.