Britain’s advertising watchdog has launched an investigation into budget carrier Ryanair, after receiving 1,600 complaints about an ad that suggested consumers should jab and go.

The Advertising and Standards Authority said Monday that some consumers objected to the ad, which featured a syringe and a small bottle labelled vaccine.

Some argued it was misleading to suggest the vaccine will be rolled out across the population by the spring and that travel restrictions would be over. Others objected to what they saw as the trivialization of the impact of the pandemic on society.

The ad promoted flights to sunny European destinations and offered seats for £19.99 pounds ($27), telling customers to jab & go.

Britain ramped up its vaccination program Monday by becoming the first nation to start using the shot developed by Oxford University and drugmaker AstraZeneca. But it is unclear how quickly the nation can be vaccinated, as it is a huge endeavour with little precedent.

The budget carrier did not immediately respond when asked about the investigation.