The travel industry uses sophisticated AI to maximize revenue and improve customer experience. Revenue management: dynamic pricing ML models trained on booking windows, competitive prices, demand signals, events, and seasonal patterns. Airlines update prices hundreds of times daily. Booking.com personalization: test 1000+ ML experiments simultaneously, with models predicting which properties a specific user is most likely to book based on 150+ features including past trips, search context, demographics. Flight price prediction: XGBoost models trained on historical price data predicting price direction to advise travelers on when to book (Google Flights). Airbnb: photo quality scoring using CNN to rank listings, price suggestion models recommending optimal nightly rates to hosts, search ranking combining relevance + conversion probability + host reliability. NLP for review summarization: extract key themes from thousands of reviews to surface common concerns and highlights. AI travel assistants: conversational planning using GPT-4 with travel APIs for real-time availability and pricing. Demand forecasting: LSTM models for destination-level demand prediction for marketing budget allocation.