Chad in the past was a popular fuel stop in central Africa, but multiple travel warnings now advise against travel here (see the UK advice here, and the US advice here). No official airspace warnings have been issued for Chad, but danger remains high. FTTJ/Ndjamena airport was closed for 2 days in April 2021 due to security concerns following the death of Chad’s long term President - more info here. High threat for terrorism. Avoid landings.