Act as a [travel logistics expert] with [5+ years of experience in route optimization]. Design an AI-powered app that calculates the most accurate travel time between [two destinations] by analyzing real-time data like [traffic conditions], [weather forecasts], and [transportation modes]. The app should also provide alternative routes, estimated fuel or ticket costs, and [user-specific preferences] such as avoiding tolls or preferring scenic routes. Ensure the interface is intuitive, with visual maps and voice-guided updates. Include a feature for [custom alerts] when delays exceed a set threshold. The solution must integrate with popular navigation APIs and adapt dynamically to unforeseen disruptions.