Guys,
I think the question boils down to, "does an aircraft have ECG monitoring capability?"
The answer is "maybe". Some airlines are extremely progressive with their telemedicine programs. Virgin Atlantic for instance purchased the Tempus 2000, which has 12-lead capability with transmission to Medaire, an aviation medical direction center. When I worked for another company, an airline was looking to purchase a product that Physio-Control used to distribute, the Biolog. It's a handheld EKG that is placed onto the chest directly which contacts three electrodes on the back.
See it here:
http://www.univie.ac.at/cga/courses/BE513/EKG/BiologInAction.jpg
A newer version of the Tempus unit is the Tempus IC, which can be seen here
http://www.tempusic.com/
That thing has more features than some of the Lifepaks I see around on CCTs.
I will say that many airlines have gone with the Heartstart FR2 with ECG screen for the sole purpose of allowing medical professionals on board to see the screen. Heck, Philips even makes a special aviation battery specifically for the FR2.
I would also add that despite the rather significant number of meds and equipment in the EMK, there are some rather dramatic oversights (in my opinion). For instance, a glucometer is not required on board. (Probably has to do with CLIA but Air Canada does carry it on board.) And how about something stronger for nausea? (Medaire stocks their Enhanced EMKs with Zofran now instead of promethazine...neither of which is required on board...Zofran to my understanding isn't great for motion-related vomiting). And guess what about the aviation medical oxygen bottles? You aren't going to get anything more than 6lpm. So don't expect to use a non-rebreather on board.
One thing I have consistently not seen on board -- and I think this is a good thing -- is intubation equipment. Auscultation next to the jet engines is difficult to say the least, with the need to move the patient during landing, tube extubation is a genuine concern.
I've met a lot of flight attendants during training who have wonderfully varied backgrounds...surprisingly, quite a few are nurses, paramedics and EMTs themselves. So to echo what people have said, "Coding in an aircraft might not be as bad as one might think".