Flights to and from South Florida are being impacted by the blast at the Brussels airport.
Direct flights on Jetairfly, the only airline with direct flights to Brussels from Miami, are cancelled.
Two men scheduled to leave on that flight say the airline put them on standby until further notice.
A family in Boynton Beach says two relatives were supposed to leave from Brussels minutes before the blast.
Jetairfly would not confirm to the family if they got on the plane but did confirm a flight left Brussels for Miami at 8 a.m.
Security at Miami International has been increased. K9s and armed officers walked the terminals looking for suspicious activity.
The airport released the following statement:
While there is no direct threat to Miami International Airport, we have heightened the security posture we already have in place with a number of additional measures, in response to the terrorist attacks today in Brussels. Those measures include an increased presence of uniformed officers and canine units in and around the terminal. Employees across our operations have been alerted to heighten their vigilance for suspicious activity. Miami-Dade Police and the Miami-Dade Aviation Department have also increased patrols on the airport perimeter, and will increase random inspections at airport entrances. In light of these additional security measures, coupled with increased airport traffic for Spring Break travel and the Easter Sunday weekend, travelers are encouraged to arrive at the airport earlier than usual this week.
Fort Lauderdale-Hollywood International Airport tweeted that it remains "on a high level of alert as always."
The Palm Beach County Sheriff''s Office, which provides security at Palm Beach International Airport, reminds residents that if they "see something, say something."
NBC News reports increased security at multiple airports across the country.