ATKearney Dubai has the following process:
First, some candidates are introduced to pre-call, which is the short introdusction call for 10-15 min to speak about your motivation and CV (I think this you have already passed)
Then there are several rounds of interviews, depending on the candidate it might be 3-4 sometimes even 5 interviews, if there some doubts. In every case interview specific aspects are tested, so you have personal fit, where you might be asked about intellectual curiousity, teamwork, leadership and all this kind of staff as well as you have a case. Cases might be different either market-sizing or operations cases in different interview rounds.
Interview becomes harder from round to round. First starting with managers, then principals, then partners. And there is kick-off system: you actually need to pass the interview in order to get to the next level.
Regarding flying from Europe to Dubai, normally this is a case, but given current situation with COVID, I'm not sure that this is going to happen. I think that the entire interview will take place online.
I have many friends working with ATKearney Dubai and already helped candidates to get there.
If you need any help, drop me a line directly.