Estar a la que salta

[ROBINDESBOIS]

English?
Estar a la que salta means to be after everything good, e.g if they offer champagne in a place you´re up on everything.

[Perikles]

éste siempre está a la que salta = he never misses a trick

also= he never misses an opportunity to criticize

[JPablo]

Cambridge Klett also gives these options,

andar a la que salta = to seize the opportunity

estar a la que salta = to look out for an opportunity

I prefer the options given by Perikles (Oxford bilingual).
The Cambridge translation misses a bit the "durative" aspect of the Spanish expression... (or rather the "condition" or "state" of "being always looking for an opportunity...)

Nuances...

[poli]

to be first in line
He's always first in line for a handout. --for example

[JPablo]

Yes, that's is close to the first sense. (Moliner gives this, in Spanish)

Estar alguien a la que salta.

1 Estar siempre dispuesto a *aprovechar una oportunidad. *Acechar.

2 No perder ocasión de patentizar una equivocación o una falta de otro en la conversación o el trato con él. *Criticar.

[ROBINDESBOIS]

to be first in line
He's always first in line for a handout. --for example
I love that one.