How do I trigger a data refresh on my FlyoutContentTemplate view model when navigating back from my add page?

I am building a Xamarin Forms application using Shell in which I am not building your typical flyout. I have created a template each for the header, footer and content. The content contains data which is fetched from a database.

I'm defining these in my app.xaml file.

<Style TargetType="Shell" ApplyToDerivedTypes="True">
    <Setter Property="FlyoutFooterTemplate" Value="{DataTemplate common:FlyoutFooterTemplate}"/>
    <Setter Property="FlyoutHeaderTemplate" Value="{DataTemplate common:FlyoutHeaderTemplate}"/>
    <Setter Property="FlyoutContentTemplate" Value="{DataTemplate common:FlyoutContentTemplate}"/>
</Style>

I have created the FlyoutContentTemplate as a RefreshView.

<?xml version="1.0" encoding="utf-8" ?>
<RefreshView 
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:InFlight.ViewModels.Common"
    xmlns:model="clr-namespace:InFlight.Core.Models;assembly=InFlight.Core"  
    x:Class="InFlight.Views.Common.FlyoutContentTemplate"
    x:DataType="local:FlyoutContentTemplateViewModel"
    Command="{Binding LoadFlightsCommand}"
    IsRefreshing="{Binding IsBusy, Mode=TwoWay}">
    <CollectionView    
        ItemsSource="{Binding Flights}"
        SelectionMode="None">
        <CollectionView.ItemTemplate>
            <DataTemplate>
                <StackLayout Padding="10" x:DataType="model:Flight">
                    <Label Text="{Binding CallSign}"
                            LineBreakMode="NoWrap"
                            Style="{StaticResource LabelMedium}" />
                    <Label Text="{Binding FlightNotes}" 
                            LineBreakMode="NoWrap"
                            Style="{StaticResource LabelSmall}" />
                </StackLayout>
            </DataTemplate>
        </CollectionView.ItemTemplate>
        <CollectionView.Footer>
            <Button Command="{Binding AddFlightCommand}" Text="Add Flight" />
        </CollectionView.Footer>
    </CollectionView>
</RefreshView>

The code behind simply sets the BindingContext.

using InFlight.ViewModels.Common;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace InFlight.Views.Common
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class FlyoutContentTemplate : RefreshView
    {
        readonly FlyoutContentTemplateViewModel viewModel;

        public FlyoutContentTemplate()
        {
            InitializeComponent();
            this.BindingContext = viewModel = new FlyoutContentTemplateViewModel();
        }
    }
}

The view model is fairly simple and handles the LoadFlightsCommand triggered by the RefreshView and the navigation to the AddEditFlightPage.

using InFlight.Core.Models;
using InFlight.Core.Respositories;
using System;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace InFlight.ViewModels.Common
{
    public class FlyoutContentTemplateViewModel : BaseViewModel
    {
        public ObservableCollection<Flight> Flights { get; set; }
        public Command LoadFlightsCommand { get; }
        public Command AddFlightCommand { get; }
        readonly IFlightRepository flightRepository;

        public FlyoutContentTemplateViewModel()
        {
            flightRepository = DependencyService.Get<IFlightRepository>();
            
            Flights = new ObservableCollection<Flight>();
            LoadFlightsCommand = new Command(ExecuteLoadFlightsCommand);
            AddFlightCommand = new Command(async () => await OnAddFlightCommand());

            ExecuteLoadFlightsCommand();
        }

        private async Task OnAddFlightCommand()
        {
            await Shell.Current.GoToAsync("AddEditFlightPage");
            Shell.Current.FlyoutIsPresented = false;
        }

        private void ExecuteLoadFlightsCommand()
        {
            IsBusy = true;

            try
            {
                Flights.Clear();
                var flts = flightRepository.GetFlights();

                foreach (var flight in flts)
                {
                    Flights.Add(flight);
                }                
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
            }
            finally
            {
                IsBusy = false;
            }
        }
    }
}

This all seems to work well, but at the moment I need to pull to refresh in order to trigger the LoadFlightsCommand.

The issue is that I want to trigger the data refresh when navigating back from my add page. I've seen posts where people tap into the OnAppearing event in order to trigger the refresh, but as I am using a template and refresh view, I don't see how I can do that.

Have I maybe taken the wrong approach and using Shell for a purpose it shouldn't be used for?

I'm thinking that the solution probably involves the events of the shell itself?

Any advice would be much appreciated.