How to temporary store in form data in .NET core - asp.net-mvc

Question

I am learning ASP.Net Core and I am creating a mock Flight booking app. On my home page, I have a search form to find a flight.
On submitting my form it goes to my SearchResultsController and then to my Search() action where I will run a search query.
What's the best way to pass the parameters through to this controller action for use in the Search() action method?
All the methods I've seen this far have involved creating new models but I don't want to save the searches to my database as it's not information that needs retaining. Having come to form a rails background I would use the parms hash which is a temporary data store.
Form:
<form asp-controller="SearchResults" asp-action="Search" method="post">
<div class="form-group">
<label for="fromAirport">Flying from:</label>
<select asp-for="AirportId" asp-items="#(new SelectList(ViewBag.ListOfAirports, "AirportId", "AirportCode"))" class="form-control">
</select>
<div class="form-group">
<label for="toAirport">Flying to:</label>
<select asp-for="AirportId" asp-items="#(new SelectList(ViewBag.ListOfAirports, "AirportId", "AirportCode"))" class="form-control">
</select>
</div>
<label for="fromAirport">Departure Date:</label>
<br />
<input type="date" />
<br />
<label for="fromAirport">No. passengers:</label>
<select class="form-control">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<button type="submit" class="btn btn-primary mt-3">Search Flights</button>
</div>
</form>