How accurately do aircraft fly PBN Routes?

From trials we have carried out, most modern aircraft will remain within 100m of a published straight route and within 500m in a large turn when they are following a RNAV1 PBN route. However, Air Traffic Control may instruct aircraft to fly off the PBN routes and so at times flights would still be seen over areas either side of the routes.

Posted in: i) General questions about routes and route alignments