The phone line exists for anything time-sensitive or complicated — a same-day rebooking, a multi-city itinerary you're not sure how to price out, or a fare that looks confusing on the search results page. It's staffed around the clock, and whoever answers can pull up live pricing while you're on the call rather than asking you to email and wait.
Email and the contact form make more sense for anything that isn't urgent — a question about a past booking, feedback on the site, or a request that needs a document attached. We read every message that comes through the form ourselves; nothing goes into an automated queue that a person never sees. Live chat sits in between the two — good for a quick yes-or-no question where you don't need a full phone call but want an answer faster than email.
