Added Splash Screens for PWA

app/Models/Airline.php

@@ -6,6 +6,7 @@ use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Airline extends Model
 {
@@ -20,6 +21,7 @@ class Airline extends Model
         'alliance_id',
         'active',
         'logo',
+        'merged_into_id',
     ];
 
     protected $casts = [
@@ -65,4 +67,19 @@ class Airline extends Model
     {
         return $this->belongsTo(Country::class);
     }
+
+    public function mergedInto(): BelongsTo
+    {
+        return $this->belongsTo(Airline::class, 'merged_into_id');
+    }
+
+    public function mergedFrom(): HasMany
+    {
+        return $this->hasMany(Airline::class, 'merged_into_id');
+    }
+
+    public function canonical(): self
+    {
+        return $this->mergedInto ?? $this;
+    }
 }