The booking fees for Envoy Airlines are not distinct from those of American Airlines, as it's under the American Airlines. Booking fees can vary significantly based on several factors, such as:
Type of Ticket Purchased: Different classes of tickets (economy, business, first class) have different fees.

Booking Channel: Fees may vary if you book through an online platform, a travel agent, or directly through the airline

Ticket Booking Fees:

Online Booking Fee: Fee for booking tickets online (though many airlines, including American, typically do not charge for this service).
Booking by Phone: There might be an additional charge for booking tickets through the airline’s reservation number.
Ticket Change Fee: Fee assessed for making changes to a ticket after it has been purchased.