Gibraltar airport is one of the toughest (civilian?) to land. Only Captains are allowed to land. Flights often get diverded to Malaga due to winds.
https://www.express.co.uk/travel/articles/696566/high-winds-...
https://www.express.co.uk/travel/articles/696566/high-winds-...
note: i am only speculating, and have no ideas of rules that prohibit two captain level pilots flying at once.