Overall, there is little to doubt the size of the existing long-haul market. Vishwanath says to get it right here, one needs a strong home market, which IndiGo is already in possession of, or a strong international hub that Emirates and Qatar Airways have built. “It also calls for a strong partner on the other side, which IndiGo needs to get,” he points out. Typically, it takes about six months for any international route to stabilise. A key reason to be in the international business is that it offers a minimum 4-5% higher operating margin than domestic. In India, fuel costs come with 28% tax, while long-haul gives you the option of fuelling abroad on return flights. That alone gives a 6-7% upside on margin. Besides, higher utilisation on international at 15-16 hours per day compares with 12-13 hours, best case, for domestic, which again lends more room to increase margin. “Long-haul, by virtue of flying longer distances and higher utilisation, allows an airline to have a lower unit operating cost,” says Vishwanath.