It seems incredible, but it is not. A plane from TAP, coming from Lisbon, attemped to land in Porto Santo without success. The low cloud and therefore poor visibility made the landing difficult.
The TP 1739 tried to land several times but could not land, and eventually diverted to Tenerife.
Flight 1739 should have landed at Porto Santo at 11:05 am with 78 passengers, then take flight to Lisbon.
Two other flights before found it difficult to land another TAP and a Easyjet flight from London, but bother eventually landing after circling for a while.