AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.app.fly">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".email_generation" />
        <activity android:name=".Get_Flight_Ticket" />
        <activity android:name=".Delete_Flight_Ticket" />
        <activity android:name=".payment_portal" />
        <activity android:name=".seat_selection" />
        <activity android:name=".Passenger_Info" />
        <activity android:name=".Selection_Of_Flight" />
        <activity android:name=".FromTo" />
        <activity android:name=".Showing_Flights" />
        <activity android:name=".Menu" />
        <activity android:name=".FlightDetails" />
        <activity android:name=".Flight_Management_Admin" />
        <activity android:name=".Admin" />
        <activity android:name=".Search" />
        <activity android:name=".Login" />
        <activity android:name=".Register" />
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>