Change pitch, roll and heading with entity.add

CesiumJS
1

I have a model that is rotated in the wrong direction by default and I need helpt with position of the model, I've solved it by changing the modelMatrix on each update but i feel like there must be some way to change the modelMatrix when I create the entity and then forget about it.

So my question boils down to this: Is there any way to change a Models Matrix on/before adding it to the scene?

The code I'm using a the moment to add the entity.

        createModelAndFlight = function(flinfo, p, id) {
            var positions = p.property,//Cesium.SampledPositionProperty
                start = Cesium.JulianDate.fromDate(new moment(flinfo.departureDate.dateUtc).toDate()),
                stop = Cesium.JulianDate.fromDate(new moment().add(200, 'minutes').utc().toDate());

            var model = new Cesium.ModelGraphics({
                uri : './models/CesiumAir/Cesium_Air.gltf',
                scale: 150,
                minimumPixelSize: 100,
                maximumPixelSize: 150,
                pickPrimitive: true,
                show: true,
                runAnimations: false
            });

            //Actually create the entity
            var entity = new Cesium.Entity({
                name : id,

                //Set the entity availability to the same interval as the simulation time.
                availability : new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
                    start : start,
                    stop : stop
                })]),

                //Use our computed positions
                position : positions,

                //Automatically compute orientation based on position movement.
                orientation: new Cesium.VelocityOrientationProperty(positions),

                //Load the Cesium plane model to represent the entity
                model: model
            });

            viewer.entities.add(entity);

            return entity;
        };