Executives at TripAdvisor and Expedia say their respective companies no longer get as many free links on Google search pages when consumers look for travel-related services, such as hotel rooms, rental cars, flights and other needs for trips or vacations. They claim Google pushes its own lodging offerings in search results, a move that hurt traffic. On the earnings call Thursday with investors and analysts, TripAdvisor Chief Executive Stephen Kaufer said “Google has gotten more aggressive."