please email your fleet asking when to expect the email with changes and to register your disappointment at the delay. politely
May I suggest that you do, as I have, copy in on your email the SVP HR & Remuneration who TCH conned into sending out the letter informing us of the delay. I generally ignore the disdain and disrespect that we get from above at EK but an unexplained delay in informing your employees what they are currently working for is inexcusable and arrogant in the extreme.