Business saver fare rules
I purchased a business saver ticket (D class) from TPE-NRT-BOS and back from the Taiwan website. In my receipt, it says
Stopovers
To U.S.: Permitted.
To Canada: 2 free, 4 at TWD2900 each.
Booking Change (*)
Before Departure To U.S.: Permitted
To Canada: Permitted at TWD3000
After Departure To U.S.: Permitted
To Canada: Permitted at TWD3000
Refund
Before Departure To U.S.: Permitted(No charge)
To Canada: Permitted at TWD6000
After Departure To U.S.: Permitted(No charge)(Refundable amount will be the difference between the fare paid and fare used.)
To Canada: Permitted at TWD6000
Several questions:
1) The refund rule states that there is no charge for refunds since this ticket destination is in the U.S. However, what does "Permitted" mean under Booking Change? Is it charged at TWD3000 or is it free?
2) Same question as in #1 except for "Permitted" under Stopover.
3) In addition, I noticed JAL charges a 2000 yen ticketing service fee for exchange/reissue. Does this get triggered by doing a refund, adding a stopover, or making a booking change? If there are multiple passengers on a single reservation, does this mean its only one 2000 yen fee or multiple ones for each passenger?
4) What is the difference between Booking Change and Rerouting?