Airbus (EPA:AIR) has signed an agreement with Indian budget airline IndiGo for 250 A320neo aircraft, in a deal worth around $26 billion.

The deal is Airbus’ single largest order by value to date. IndiGo is the country’s biggest domestic airline by market share.

Airbus are up 1.38% this morning on the news. Shares in the company have risen over the past six months after a string of lucrative deals, including one with China for 45 new planes reportedly worth $11 billion.