When a PSO has been imposed, any qualifying air carrier is allowed to commence scheduled air services meeting all the requirements of the PSO.
Wrth ddyfarnu contract yn seiliedig ar gytundeb fframwaith gyda chystadleuaeth, rhaid i’r awdurdod perthnasol wahodd pob darparwr sy’n rhan o’r cytundeb fframwaith i gyflwyno cynnig (bid).