Website tradeboard with notifications for flight crews

Flight crews on occasion wish to have someone work their last flight of their trip. You would be creating a website that lets the users create/delete posts with the information about their flight they are trying to drop or pickup. It also notify them via email when someone creates a drop post that matches what the users are trying to pick up. The program opens the first time with the preference screen. The preference screen should allow the user to store their email and airline (drop down two letter code populated by a stored database of airline codes) and position (CA, FO, FA). All fields are required before they can click save and use the rest of the app. Once the user info is saved they are taken to a blank screen with a + button on the bottom right. One half of the front end allows users to create filters that notify them via email when a post is made that match the airline, position, date range and origin/destination they are interested in. They tap the + button and they can select an action from a drop down menu "pickup someone's last live leg" or "drop my last live leg". If they select pickup, then form asks for a datetime range for the flight to depart (required), from airport (optional) to airport (optional). The form includes their airline and position also but this is hidden from the user. The default datetime range will be now until the end of today. The default "depart" and "arrive" airports will be the last entry they made, if exists. Airport codes will always be an uppercase three letters. They'll hit search below the fields, and a footer bar will display and a tab will open up titled "Posts" with any existing posts that match their filter (airline+position+date range, from, to) will display. If no matches are found it must say "No matches found" If a match is found, it's displayed along with an e-mail icon. The filter parameters can be adjusted by tapping the "filter" tab. The "posts" tab will display a save button on the bottom. The save button will display the user's filter settings to the serve and be displayed on their device the app's home screen in a box, with a red delete box. The other half of the app is for creating "drop" requests. The user must fill out a form as shown in the image and it is saved to the home screen. When the form is saved, everyone with "pickup" requests must be notified of the new "drop" post via email.