Airbus is in advanced discussions over a major new order from Mexico's ultra-low carrier Viva Aerobus, industry sources said on Sunday.
The number of new narrowbody planes being discussed surged to triple digits, meaning at least 100, the sources said, declining to go into more detail.
We currently had an ongoing order of A 321 neo with Airbus until 2027, Viva Aerobus said in a statement.
Whilst Viva is a leading and expanding ULCC in the Americas, we have not signed any new order with any manufacturer.
In 2013 it defected to Airbus after a fiercely fought battle between the two plane giants, which resulted in a significant order worth up to $4 billion for 40 Airbus A 320 family jets.
With the Paris Airshow looming this week, it has become a flashpoint once again as Boeing sought to win the airline back, but Airbus is favourite to win again this time.
The deal is not guaranteed pending further talks, they said, but could be announced at a July 19 - 25 event.