IndiGo's mass cancellations explained

From the BBC World Service: Major airports in India have descended into chaos after the airline IndiGo either canceled or delayed hundreds of flights for the fourth consecutive day. IndiGo says there have been technical issues with aircraft or winter schedules that have delayed some flights, but the biggest reason is a pilot shortage. Also, the Democratic Republic of Congo and Rwanda have signed a peace deal, and some countries are boycotting Eurovision over Israel's involvement.