New Zealanders flying to London this week could be caught up in a strike by two million British public service workers.
Air New Zealand has offered to re-book passengers who are due to arrive at Heathrow on Wednesday, the day of the planned walk-out.
British airport authorities are warning it might take 12 hours to clear customs if the strike goes ahead.
Airlines say they are cancelling some flights in and out of London's Heathrow Airport ahead of the strike.
Heathrow's owner, BAA, warned last week of possible 12-hour delays moving through immigration because the strike is expected to cripple the UK border agency. It has asked airlines to fly half-full planes into Heathrow during the strike.
Middle East carrier Etihad Airways says it has cancelled two flights from Abu Dhabi and one flight from Heathrow to Abu Dhabi to spare customers any disruptions.
Greece's Aegean Airlines said it cancelled one Heathrow to Athens flight and one from Athens to Heathrow because airport authorities warned of "potentially huge problems with delays".
3 News / AP