Passengers using trains between London and the Sussex coast are being asked how they want timetables to run after the Gatwick Express is axed.
The axing of the Gatwick Express was announced in February
The government announced in February it was halting the non-stop service from London Victoria to the airport.
Since then, rail and aviation companies have been consulted and a number of possible timetables drawn up.
Transport Secretary Douglas Alexander said the aim was to ease overcrowding on the Brighton Main Line.
Figures released in February showed that during peak morning hours the Gatwick Express was just over half full.
"It is important that we seek to balance the needs of Gatwick Airport passengers while enhancing services for Sussex Coast commuters," said Mr Alexander.
Local authorities, the travel trade and passenger groups are among those being consulted and members of the public can also send their views to the Department for Transport.
The consultation period ends on 22 December.