From the BBC:
"Hong Kong's main airline, Cathay Pacific, has chartered 10 aircraft and their crew from Chinese airlines to help counter industrial action by its own pilots.
On Wednesday, more than a third of Cathay's flights were delayed by the protest.
Pilots have for the last three days been turning up later than normal for flights and strictly following pre-takeoff procedures.
Rival Chinese airlines are benefiting from the dispute
The pilots are demanding improved pay and conditions and say they will continue their work-to-rule until the airline makes a reasonable offer.
The chartered planes have come from rival airlines in China, including regional carriers like China Northwest, China Southwest and China Eastern.
Over 70 Cathay Pacific flights have now been affected because of the pilots' protest. On Wednesday, the airline said over a third of all its flights were delayed - some by up to five hours.
Hong Kong's deputy leader, Donald Tsang, has said that the industrial action might harm Hong Kong's status as a regional aviation hub as well as its tourism and transport industries. But, he said, the government had no plans to intervene.
Talks brokered by Hong Kong's Labour Department broke down last week and neither side looks ready to return to the negotiating table.
Cathay Pacific's decision to hire new aircraft may keep up a full schedule of flights, but some of its passengers may not be happy to be transferred from one of Asia's largest airlines to a smaller Chinese carriers."