Travel classes

Can I upgrade to First Class with Czech Railways - ČD?

What travel classes are available with Czech Railways - ČD?

What travel classes are available on EuroCity Italy-Switzerland trains with Czech Railways - ČD?

What travel classes are available on Trenitalia Intercity Night trains with Czech Railways - ČD?

What travel classes are available on Trenitalia Leonardo Express trains with Czech Railways - ČD?