This flight was booked for me.


1. 1LASTNAME/FIRSTNAMEMR
1 EK 56 S 3JUN DUSDXB HK1 1515-7 2340-7 Y-S
2 EK 55 S 7JUN DXBDUS HK1 0850-4 1325-4 Y-S

My questions are:
1. what does the first S after the flight number stand for?
2. What does HK1 mean?
3. What does Y-S mean (I know Y is economy, but the S means nothing to me)

Thanks for your help,
Rimpeltje