Don't worry!
This company is not consistent at getting back to people on interviews. Some people are interviewed and then have a class date within 48 hours of the interview. Others (like me 1 1/2 years ago) had to chew their fingernails for almost 3 weeks before getting a call.
Right now, the company is buried in CRJ stuff, summer flying increases, and the usual airline BS so if you don't hear anything for even 2 weeks, don't worry too much. Remember, most of the people they interview are hired - they don't bring you in unless they decided you were more than OK on paper and at that point, the job is yours to lose. If your personality or your flying skills suck, well then you're screwed at any airline you interview at.
Cheers