# How does flight mode impact push notification reception?
Notifications are not received when the device is in flight mode (except when Wi-fi is activated). However, once this mode is turned off, the pending notifications may be delivered to the user, depending on the OS:
## On iOS
After flight mode is deactivated, only the last push sent will be received. This is the behavior of the Apple / APNS push API, and does not depend on Batch.
{% hint style="warning" %}
If you want more information, see the **technical documentation** [here](https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/APNSOverview.html#//apple_ref/doc/uid/TP40008194-CH8-SW5).
{% endhint %}
## On Android
By default, Batch offers the same behavior as iOS, but you have two ways to control it.
**1. Via the "**[**Collapse Key**](https://doc.batch.com/dashboard/push/message-edition#fcm-collapse-key)**"**
On the dashboard, you can ensure that all pushes are received:
* From the **Creation Campaign Form** > **Advanced Settings** > **Disable the Collapse Key**:
[](https://downloads.intercomcdn.com/i/o/1078121613/252b326c41414e488320c063/CleanShot+2024-06-11+at+12_14_02.png?expires=1741883400\&signature=2df7960b49161368995f730176e6bdbf1925a6ac3c3d0184bb27146413f2a9b7\&req=dSAgHsh8nIdeWvMW1HO4zUCekxYRd6Fyw55E8m6zhfZbMVwYkGz73ydC6w9c%0AO52xxHZZ9Mn8wKfxYHc%3D%0A)
* From the settings of your **Android app** > **Push Settings** > **Default Push Settings** > **Disable the Collapse Key** and click on the "**Update Push Settings**" button:
[](https://downloads.intercomcdn.com/i/o/1078122609/40922891b287a1664f9fc986/CleanShot+2024-06-11+at+12_14_35.png?expires=1741883400\&signature=92a2a86a913a9b7d2c561f9963814e3e06f79b44d5d69bb7734f6b84279df1f9\&req=dSAgHsh8n4dfUPMW1HO4zcIgPzkQ3UDqZLHPPl%2B99vQfdeeZWT0qrL9ThbS1%0AjVriRBXwBZ24YRuaCRU%3D%0A)
**2. Via** [**APIs**](https://doc.batch.com/api/prerequisites)
You can set up a specific behavior or a mix of different behaviors, for instance:
* All the notifications are kept and will be delivered
or
* All the transactional pushes are delivered, but only the last marketing push is delivered
{% hint style="warning" %}
If you set up a [TTL](https://doc.batch.com/dashboard/push/message-edition#expiration-ttl) on your push or in your app settings, if the push is not sent in the fixed limit, it will never be sent.
{% endhint %}
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