Joe Duffy is back in Belfast after his 24 hour journey
The cancellation of all flights out of Northern Ireland because of the volcanic dust cloud led to a windfall for one Belfast taxi driver.
The driver was asked on Thursday by a group of businessmen to drive them to London.
He took them to Stranraer on the ferry before driving the five passengers to Heathrow.
The 400-mile trip cost the businessmen £650 but they generously left him a £50 tip.
Taxi driver Joe Duffy said he initially thought he was taking the five men to the ferry terminal in Belfast.
"I got a call to go to the Hilton hotel in Belfast. On the way down to the ferry, they asked me if I would take them to London. I thought it was a joke and they said, no."
They told Mr Duffy they needed to get to Heathrow to pick up their cars and said taking a taxi would be a lot cheaper than paying for buses and trains.
"I agreed a price and ended up in London last night. I've been on the road since 1300 BST on Thursday and I can't wait to get home to get into my bed."
Fonacab said the trip was the longest and costliest, that any driver in the firm has undertaken.