Waitlist clearance requests are more likely to be acted on if they come from the travel agent than the passenger, especially as different airlines have different procedures and we knows best from whom at the airline to request prioritization.
Call us, we may be able to use "block" space held by us, by the airline, or by a consolidator for all or part of your itinerary. If seats are not available, we can push carriers to confirm waitlisted for you, and you will enjoy the lowest fares!