The US space shuttle Discovery landed safely at its Florida home base yesterday after a gruelling but successful 15-day construction mission that prepared the International Space Station for new laboratories.

Gliding through crisp, clear skies, the shuttle settled onto a concrete, canal-lined landing strip at the Kennedy Space Centre at 1.01 p.m. (1801 GMT).

Double sonic booms rang through central Florida as the shuttle neared the end of its trek of 10 million kilometres that began with its launch on October 23.

Commander Pamela Melroy, only the second woman in Nasa's 50-year history to land a spaceship, took over manual control with 15,240 metres to go, gently steering the 100-tonne shuttle through sweeping curves to burn off speed.

"Congratulations on a tremendous mission and a great landing, Pam," astronaut Terry Virts radioed to the crew from Mission Control in Houston when Discovery rolled to a stop.

During 11 days at the space station, the Discovery crew delivered and installed a new module, named Harmony, that will be the connecting node for Europe's Columbus and Japan's Kibo laboratories.

Deliveries of both labs are running about five years behind schedule due to station construction delays, first by Russia and more recently by the United States, which grounded its shuttle fleet for two and a half years after the 2003 Columbia disaster. The shuttles are the only spacecraft capable of carrying some of the large station parts.