ProjectLaravel/database/migrations/2020_12_21_192049_create_routes_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateRoutesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('routes', function (Blueprint $table) {
            $table->id();
            $table->bigInteger('departure_airport_id')->unsigned();
            $table->bigInteger('arrival_airport_id')->unsigned();
            $table->foreign('departure_airport_id')->references('id')->on('airports')->onDelete('cascade');
            $table->foreign('arrival_airport_id')->references('id')->on('airports')->onDelete('cascade');
            $table->time('flight_duration');
            $table->decimal('price', 10, 2);
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('routes');
    }
}