Binding property "fromICAO" not found on "ViewModel" in collectionview

I am trying to show data using a collection view in Xamarin but the Binding for the text in one of the labels cannot find the property in the viewmodel

my view:

<CollectionView x:Name="ItemsCollectionView"
                                ItemsSource="{Binding Plans}"
                                SelectionMode="None">
                    <CollectionView.ItemTemplate>
                        <DataTemplate>
                            <Frame HasShadow="True">
                                <StackLayout>
                                    <Grid>
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="60"/>
                                        </Grid.RowDefinitions>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition/>
                                            <ColumnDefinition/>
                                        </Grid.ColumnDefinitions>
                                        <StackLayout Spacing="0">
                                            <Label Text="From:" 
                                                   FontSize="10"
                                                   TextColor="Black"></Label>
                                            <Label Text="{Binding fromICAO}" 
                                                   FontSize="24"
                                                   TextColor="Black"></Label>
                                            <Label Text="To:" 
                                                   FontSize="10"
                                                   TextColor="Black"></Label>
                                            <Label Text="{Binding toICAO}" 
                                                   FontSize="24"
                                                   TextColor="Black"></Label>
                                        </StackLayout>
                                        <StackLayout  Spacing="0"
                                                      Grid.Column="1">
                                            <Label Text="Distance:" 
                                                   FontSize="10"
                                                   TextColor="Black"></Label>
                                            <Label Text="{Binding distance}" 
                                                   FontSize="24"
                                                   TextColor="Black"></Label>
                                            <Label Text="Fuel used:" 
                                                   FontSize="10"
                                                   TextColor="Black"></Label>
                                            <Label Text="{Binding fuelUsed}" 
                                                   FontSize="24"
                                                   TextColor="Black"></Label>
                                        </StackLayout>
                                    </Grid>
                                </StackLayout>
                            </Frame>
                        </DataTemplate>
                    </CollectionView.ItemTemplate>
                </CollectionView>

my viewmodel:

public ObservableCollection<PlanToFirestoreModel> Plans { get; set; }

        public PlansViewModel() {
            firestoreService = DependencyService.Get<IFirestoreService>();
            auth = DependencyService.Get<IFirebaseAuthentication>();
            Plans = new ObservableCollection<PlanToFirestoreModel>();

            FillData();
        }

        public async void FillData()
        {
            var tempPlans = await firestoreService.GetFlightPlansByUid(auth.GetUserInfoAsync().Id);
            foreach (var plan in tempPlans)
            {
                Plans.Add(plan);
            }
        }

and my Model itself:

public class PlanToFirestoreModel : BasePlanModel
    {
        public string fromICAO { get; set; }
        public string toICAO { get; set; }
        public string fromName { get; set; }
        public string toName { get; set; }

        public int id { get; set; }
        public string userId { get; set; }
        public string aircraft { get; set; }
        public string deptCountry { get; set; }
        public string arrCountry { get; set; }
        public double fuelUsed { get; set; }
        public string flightNumber { get; set; }
        public double distance { get; set; }
        public string altitude { get; set; }
        public string createdAt { get; set; }
        public double deptLon { get; set; }
        public double deptLat { get; set; }
        public double arrLon { get; set; }
        public double arrLat { get; set; }
    }

The XAML page can find the Plans ObservableCollection itself but not the properties that are supposed to be in the list like "fromICAO" and "toICAO"
What am I doing wrong?