We had used Holiday Extras transfers several times before without any problems. However, this time on arrival at the transfer desk in Tenerife South Airport we were told the driver was on his way, but we had to wait at least half an hour before the taxi arrived, whereas we were expecting, and were told that the driver would be waiting for us. The pick up time for the return journey from the hotel to the airport was not realistic. We had a pick up time if 13:10, and the plane had a departure time of 15:40. Ordinarily this would have been ok, but on the way to the hotel on arrival we noticed large traffic jams in the direction of the airport, and we had also been made aware of long delays at the airport. We spoke to our TUI rep and because of the above issues she suggested a pick up time of 12:00. I spoke to the emergency number and they did amend the pick up time to 12:00, and the taxi arrived at the hotel on time.