Try Michael O'Leary, the actual boss. :)

I heard the web site was developed for them for FREE by students!

Dear Mr Paddy McRyan

I understand you are planning to take your booking website offline for 3 days to perform crucial upgrades, a move that will cost an estimated 30 million euros. 

I have a proposition for you. for the cost of 15 million euros, i will provide you with new servers which will be configured offline with your new upgrade. 

Then, at a pre-agreed time, i will change the connection from the old server to the newly upgraded one.

This should leave you offline for a matter of seconds.

You therefore save 15 million euros by not losing sales and I can buy guinness until the cows come home.

I look forward to hearing from you.