Shares of IndiGo and SpiceJet have been impacted by fluctuations in crude oil prices, which are being influenced by US-Iran tensions. The stocks have experienced both declines and gains, with some reports indicating they have fallen by as much as 8% and others showing they have risen by up to 7%. The direction of the stocks appears to be tied to the movement of crude oil prices, with increases in oil prices weighing on the airlines and decreases providing a boost.