Why isn't a fee (for example a fuel surcharge) pulled into my quotes?
Fees flow into quotes only when they are configured with the correct unit and applicability in Aircraft Fees, so a missing fee usually means its unit or conditions don't match the quoted flight. Review the fee definition — unit, aircraft, and validity — and re-price the quote after correcting it.
Why doesn't the Sales module update after a flight is moved to another aircraft?
When a flight is changed to another tail as an option, the original quote keeps its own itinerary until the change is confirmed or the quote is updated. Verify which trip/option the Sales view is displaying, and refresh or update the quote to reflect the operational change.
Are tax changes applied to quotes created before the change took effect?
Quotes keep the tax rules that were valid when they were created, and new rates apply to newly priced quotes — this is deliberate, so historical quotes stay auditable against the terms the client was actually given. If an old quote must reflect a new rate, re-price it after the change date.