The planned Dubai Metro Purple Line will not get the go-ahead until there is adequate demand, transport chiefs have said.
Plans for the line are "in the air" at present, Roads and Transport Authority chairman and executive director Mattar Al Tayer told Construction Week.
The Purple Line will provide a high-speed link between Dubai International Airport and the under-construction Al Maktoum International Airport in Jebel Ali.
Plans for the original line showed a 49km link with eight stations along its length. It was intended to cut travel time between the two airports to 40 minutes.
But Tayer said: "For the time being we are not really in a position to answer (questions concerning the purple line). We are considering different methodologies, and it's a plan for the future. I cannot tell you exactly what route it will take. It's in the air, but it will link the two airports."
His comments come as RTA chiefs announced work on the Red and Green Lines were on schedule despite the global economic crisis.
The red line, which is due to open on Sept. 9, 2009 runs a total of 52.1km from Rashidiya to Jebel Ali.
The green line, stretching 23.9kms around Dubai creek from Al Qusais to Jedaff, is set for completion on March 21, 2010.
The Purple Line was announced in June 2007, and construction was originally slated to begin in March at a cost of $2.73 billion but thetime table has now been pushed back indefinitely, with the RTA saying construction will not begin until "there is a visible need".
"Whenever there is a visible need for this line to be built, it will be built," RTA CEO for strategy and corporate governance Abdul Ibrahim Younis said.
Younis said the construction timetable would depend upon the progress of developments surrounding the proposed route, and that any delays to those projects may push back the Purple Line.
Younis added that studies already under way would ensure the Purple Line was built according to the needs of the surrounding population.