Air New Zealand has challenged Qantas to paint its planes black if the All Blacks win the Rugby World Cup against the Wallabies this weekend.

The two airlines have taken to Twitter to suggest a friendly wager over the final.

Using the hashtag 'AirlineWager', Air New Zealand has tweeted a picture of a Qantas plane in New Zealand colours with an All Blacks logo and other slogans.

.@Qantas So we’ve been thinking about this wager. How about you paint your planes like this? #AirlineWager #NZLvAUS pic.twitter.com/46HhWkVyi7

— Air New Zealand (@FlyAirNZ) October 29, 2015

Qantas has responded with a picture of an Air New Zealand plane painted gold with Wallabies branding.

.@FlyAirNZ While black is slimming, we think it needs a golden touch. Something like this... #AirlineWager #NZLvAUS pic.twitter.com/FxADqwUsdJ

— Qantas (@Qantas) October 29, 2015

Its tweet said 'while black is slimming, we think it needs a golden touch'.

Air New Zealand dismissed the suggestion on Twitter saying it wouldn't want to slow its planes down.