Is chamonix helbronner open around may 10th

Looks like its open year round: https://www.chamonix.com/aiguille-du-midi-timetables-and-rates,180,en.html

I did it in June and it was the best thing I've ever done in Europe. We went one-way from Courmayeur to Chamonix.

Here's a link to the Courmayeur-Hellbronner portion, in case you're interested: http://www.montebianco.com/en/tariffe-5.html

Rose,

According to this website, the Panoramic Mont Blanc is only open from June to September (look in the gray box titled "Description"). I assume that's what you meant by "the hellbronner section which has the 360 degree view"?

https://www.chamonix.com/telepherique-de-l-aiguille-du-midi,94-156953,en.html

I got a reply from the official site that they aren't very sure when it will be open but it surely wont be open in may.
I can still go to hellbronner through the italy route but i think i will decidr that on the fly.
Thanks for all the replies