An Australian military aircraft has spotted four orange objects at sea, more than two metres in size, which will be analysed by the Australian co-ordination centre for missing flight MH370.

Clear skies and a search zone closer to land had meant greater visibility and a cluster of object sightings for the Australian P-3 Orion crew captained by Flight Lieutenant Russell Adams on Sunday.

"We were able to detect many objects in the water today," Flight Lieutenant Adams said, speaking on the tarmac at RAAF Pearce base Sunday night, after an 11-hour mission.

"We were able to rule a few out as fishing buoys and fishing nets, however, of interest today we did encounter an area within approximately five nautical miles which included at least four orange coloured objects greater than approximately two metres in size each.