Hey MCS_aspirant. I got an email with acceptance and an invitation to the aero visit day a couple of days ago as well, though my email specifically stated that I would receive a travel reimbursement with attached forms to fill out. Are you an international student, because I've heard some schools don't offer travel reimbursements to people who don't live in the US?
Edit: Just saw that your location was USA so obviously you aren't an international student. I would only assume that maybe they are really selective about giving out travel reimbursements? Have you already received an acceptance letter, or just the email?