A flight from Zante where nearly 200 people were told to self-isolate was a “debacle” with many travellers not wearing masks, a passenger has said.
Stephanie Whitfield told the BBC the Tui flight was full of “covidiots” and “inept crew who couldn’t care less”.
Sixteen passengers on flight TOM6215 from the Greek island to Cardiff have now tested positive, Public Health Wales (PHW) said.
Tui said safety was a priority and it was concerned by Ms Whitfield’s claims.
“Our crew are trained to the highest standards,” the airline said. “A full investigation is now under way as these concerns weren’t reported during the flight or before today.”
The 193 passengers and crew who were on board the flight on 25 August are being asked to self-isolate for a fortnight.
Health officials said seven people from three different parties are believed to have been potentially infectious on board the aircraft.
PHW’s Dr Giri Shankar told BBC Radio Wales people returning from Zante in particular are “picking up the infection and are coming to our attention”.
Greece and its islands remain on the UK government’s list of quarantine exempt countries meaning travellers do not need to self-isolate on their return.
Ms Whitfield said she and her husband had decided to self-isolate before they had even learned about the positive cases.
“This flight was a debacle. The chap next to me had his mask around his neck. Not only did the airline not pull him up on it, they gave him a free drink when he said he knew a member of the crew,” Ms Whitfield said.
“Loads of people were taking their masks off and wandering up and down the aisles to talk to others.
“As soon as the flight landed, a load of people took their masks off immediately. The flight was full of selfish ‘covidiots’ and an inept crew who couldn’t care less.”
Ms Whitfield told BBC Radio 4’s Today programme she noticed a crew member ask one woman to put her mask on.
“But the vast majority of people weren’t being spoken to, and there was a chap sat next to me who had his mask around his chin for the full flight, and the stewardess was talking to him and she didn’t say anything to him [about the mask],” she said.
The couple have now sent off for a test as they are experiencing mild symptoms, she added.
Tui said in a statement on Monday: “Passengers are informed prior to travel and via PA announcements on the flight that they have to wear masks throughout and are not allowed to move around the cabin.
“Masks can only be removed when consuming food and drink.”
Dr Shankar, PHW’s Covid-19 incident director, told BBC Breakfast that public health officials initially identified seven people who had tested positive and were potentially infectious on the flight.
He said since they began alerting passengers, the number of confirmed cases has risen to 16, but it was unclear where they had contracted the virus.
He said that any of the 187 passengers and six crew on board the three-and-a-half hour flight from Zakynthos to Cardiff Airport on Tuesday that had symptoms “should book a test without delay”.
It comes as a group of people from Plymouth tested positive for the virus after returning from Zante last Monday.