The cost of failing to keep adequate separation will be in the millions after an incident in which two planes collided on the tarmac in Dubai.
A British Airways Airbus A350 collided with an Emirates Boeing 777, causing serious damage to both aircraft.
"We can confirm that early Tuesday morning, another airline's aircraft made contact with a stationary Emirates aircraft at Dubai International Airport. No one was injured. The incident is under investigation," Emirates said in a statement.
British media reports the A350 was pushing back from its gate and was about to operate a cargo flight to London when the crash occurred.
Images posted on social media show the horizontal stabaliser of the British Airways aircraft piercing into the rear of the Emirates aircraft.
The repair bill is likely to be very high - both aircraft come with a price tag of more than $500 million.
Both airlines are operating a minimal number of passenger flights due to the COVID-19 travel restrictions.