The Directorate General of Civil Aviation (DGCA), India's aviation regulator, has sent a warning letter to IndiGo Airlines, the country's largest airline, regarding its compliance with temporary domestic airfare caps imposed by the government in December 2025. The DGCA's letter highlights concerns over certain airfares that were offered during the period when these caps were in effect. In response, IndiGo has taken corrective actions, including refunding excess charges to passengers. The airline clarified that it does not expect any significant impact on its financials or operations from this regulatory issue. IndiGo's parent company, InterGlobe Aviation, saw its shares drop by more than 1% to ₹4,567.20 on the National Stock Exchange (NSE) following the announcement. The stock has experienced a decline of over 20% in the past six months and about 18% over the past year, with a 52-week high of ₹6,232.50 and a low of ₹3,895.20. Additionally, IndiGo announced plans to raise fuel charges for new bookings due to rising aviation fuel costs.