Originally Posted by MarcB

If you want to see the booking class, once you have selected your flights and are on the "Review" page, right click on your mouse and click on "view source". When the source page opens, scroll down until you see (after a big blank section) a line that starts with "var mileageRequest". Then look a little further down (about 8 rows) for the line that says "mileageRequest += "&CLASSES=". After the = sign, you will see the booking classes for each sector. If you are doing a multi-sector itinerary, it is relatively easy to view which sector is which by looking at the entry a few lines above which starts with "mileageRequest += "&SECTORS=". Each sector is separated by a comma, and the fare classes follow the same format. For example a SYD-BNE-SYD you see the following in the source code:

var mileageRequest = this.earnPointsConnectorUrl;
mileageRequest += "&REQUEST_ID="+this.earnPointsRequest_Id;
mileageRequest += "&SECTORS=SYD/BNE,BNE/SYD";
mileageRequest += "&SEGMENT_ID=1,2";
mileageRequest += "&FLIGHT_NUMBERS=532,557";
mileageRequest += "&AIRLINE_CODES=QF,QF";
mileageRequest += "&OPERATING_CODES=*,*";
mileageRequest += "&NB_STOPS=0,0";
mileageRequest += "&CLASSES=L,E";
mileageRequest += "&FQTV_NUMBER_LIST=*";
mileageRequest += "&DATES=150320101505/150320101535,150320101925/150320102200";
return mileageRequest;

I have found this an invaluable method for checking which fare class I am booking into, especially when trying to ascertain best fare availability with ExpertFlyer etc.

This method works for both domestic and international bookings. For example, SYD-SIN-SYD returns this:

var mileageRequest = this.earnPointsConnectorUrl;
mileageRequest += "&REQUEST_ID="+this.earnPointsRequest_Id;
mileageRequest += "&SECTORS=SYD/SIN,SIN/SYD";
mileageRequest += "&SEGMENT_ID=1,2";
mileageRequest += "&FLIGHT_NUMBERS=5,6";
mileageRequest += "&AIRLINE_CODES=QF,QF";
mileageRequest += "&OPERATING_CODES=*,*";
mileageRequest += "&NB_STOPS=0,0";
mileageRequest += "&CLASSES=V,V";
mileageRequest += "&FQTV_NUMBER_LIST=*";
mileageRequest += "&DATES=160320101655/160320102145,220320101955/230320100625";
return mileageRequest;

So in this case, the fares selected are booking into V class.

Hope this helps!