Qatar Airways has increased its stake in British Airways parent International Airlines Group (IAG).
The Gulf carrier, which is backed by the Qatari state, now owns 25.1% of IAG after growing its shareholding from 21.4%.
No sum for the deal was disclosed when it was announced on Wednesday (19 February).
Qatar Airways chief executive Akbar Al Baker said: “Our investment to date has been highly successful and the announced increase in our shareholding is evidence of our continued support of IAG and its strategy.
“Qatar Airways continues to consider opportunities to invest in airlines and support management teams that share our vision to enhance travel opportunities for airline passengers across the globe.”