Question: Along with Air India and IndiGo, what Mumbai-based airline is in India's top three for passenger numbers?

The history of rail transport in Pakistan covers the period beginning in 1858 during the British Raj, when several railway companies began laying track and operating in what is today Pakistan, and ending during the present-day nationalised company under the name of "Pakistan Railways" (initially known as "Western Railways").  The railway system in Pakistan was originally built as a patchwork of local rail links operated by small private railway companies.  These included the Scinde Railway, Punjab Railway, Delhi Railway and Indus Steam Flotilla companies.  In 1870, these 4 companies were amalgamated into the Scinde, Punjab & Delhi Railway company.  Shortly thereafter, several other railways lines were built including the Indus Valley State Railway, Punjab Northern State Railway, Sind–Sagar Railway, Sind–Pishin State Railway, Trans–Baluchistan Railway and Kandahar State Railway.  These 6 companies along with the Scinde, Punjab & Delhi Railway company merged together to form the North Western State Railway in 1880.  In 1947, when Pakistan achieved its independence from Great Britain, the North Western Railway renamed  Western Railways and the railway system underwent reorganisation, some of which proved controversial.  From the start of 1948, usage of railways increased and the network became profitable.  Declining passenger numbers and financial losses in the late 1980s to early 1990s prompted the closure of many branch lines and small stations.  The 1990s saw severe cuts in rail subsidies and mismanagement within the company.  Due to falling passenger numbers, rail subsidies from the government are necessary to keep the railways financially viable. <SEP> Jet Airways (Hindi: जेट एयरवेज , "Jet Eyaravej") is a major Indian international airline based in Mumbai.  In July 2017, it was the second largest airline in India after IndiGo with an 18.2% passenger market share.  It operates over 300 flights daily to 68 destinations worldwide from its main hub at Chhatrapati Shivaji International Airport and secondary hubs at Amsterdam Airport Schiphol, Chennai International Airport, Indira Gandhi International Airport, Kempegowda International Airport and Netaji Subhas Chandra Bose International Airport. <SEP> Air India Cargo was a cargo airline, it was the freight carrying subsidiary of Air India, based in Mumbai.  It operated freighter aircraft services off and on at different stages of its history, the latest being from 2006 to 2012.  Although the company has stopped operating as an airline it continues to manage the belly cargo hold capacity of Air India's passenger fleet. <SEP> Air India is the flag carrier airline of India.  It is owned by Air India Limited, a government-owned enterprise, and operates a fleet of Airbus and Boeing aircraft serving 90 domestic and international destinations.  Additionally, the carrier is the third largest domestic airline in India in terms of passengers carried (after IndiGo and Jet Airways) with a market share of 13.5% as of July 2017.  The airline has its hub at Indira Gandhi International Airport, New Delhi, alongside several focus cities across India.  Air India is the largest international carrier out of India with an 18.6% market share.  Over 60 international destinations are served by Air India across four continents.  The airline became the 27th member of Star Alliance on 11 July 2014.