By Elizabeth Cohen
CNN Senior Medical Correspondent

Right now I’m at a Florida airport with doctors from the University of Miami who are trying to fly into Haiti to rescue the critically ill and bring them back here for treatment. It’s been a frustrating day for this group. The doctors and I and my crew – CNN Medical Producer John Bonifield and CNN Photojournalist Ferre Dollar - were supposed to leave on a 10 a.m. flight to Haiti, but we still haven’t left yet. Just got off the telephone with Laura Brown at the Federal Aviation Administration, who explained why: No more charter flights are allowed to leave from the U.S. for Haiti because there’s such heavy traffic on the ground at the airport in Port au Prince. It’s a one-runway airport with limited ramp space, and Brown tells me 11 flights are circling over Port-au-Prince waiting to land and get aid to the people who need it. So that no more flights take off without a place to land, the FAA decided to do the groundstop in the U.S.

The University of Miami did manage to get a flight out Wednesday night and then another flight out early Thursday morning before the groundstop, bringing back more than a dozen injured people from Haiti. I’ll let you know if we get to take off later today.

Editor's Note: Medical news is a popular but sensitive subject rooted in science. We receive many comments on this blog each day; not all are posted. Our hope is that much will be learned from the sharing of useful information and personal experiences based on the medical and health topics of the blog. We encourage you to focus your comments on those medical and health topics and we appreciate your input. Thank you for your participation.