Written based on suggestion from @BertGroner1960 in #249

Is your feature request related to a problem? Please describe. I know where I want to fly from, but I'm interested in a more specific location than the filters can suggest. E.g. I want to fly to London, but there's multiple airports there. Today's country filter today is too wide for this.

Describe the solution you'd like Add cities who have multiple airports to the destination area filters, so search results can help me choose which city airport I should go for. Could be possible to choose multiple cities as well.

Describe alternatives you've considered Browsing city airports in the scenery page