Shares of India’s major low cost airline gained in trade on Tuesday, after the firm retained the top spot in terms of market share in the month of December. IndiGo shares gained by nearly 6% to intra-day high of Rs 1,126.40 on BSE. According to latest figures provided by Directorate General of Civil Aviation (DGCA), IndiGo’s market share has increased marginally to 43.2% from 43% in the month of November.