[In Longman dictionary](http://www.ldoceonline.com/dictionary/already)

> 
> GRAMMAR: Word order • Already often comes at the end of a sentence:
> 
> 
> I knew that already.
> 
> 
> I was tired already.
> 
> 
> I have booked the tickets already.
> 
> 
> As well as at the end of a sentence, already can be used in the
>  following ways:
> 
> 
> • Already can come before a main verb:
> 
> 
> I already knew that.
> 
> 
> • Already comes after ‘be’ when it is the main verb:
> 
> 
> I was already tired.
> 
> 
> ✗Don’t say: I already was tired.
> 
> 
> • Already comes after the first auxiliary verb:
> 
> 
> I have already booked the tickets.
> 
> 
> ✗Don’t say: I already have booked the tickets.
> 
> 
> 

[In Oxford dictionary](http://www.oxfordlearnersdictionaries.com/definition/english/also?q=also)

> 
> also / as well / too
> 
> 
> Also is more formal than as well and too, and it usually comes before
>  the main verb or after be: I went to New York last year, and I also
>  spent some time in Washington. In British English it is not usually
>  used at the end of a sentence. Too is much more common in spoken and
>  informal English. It is usually used at the end of a sentence:‘I’m
>  going home now.’ ‘I’ll come too.’. In British English as well is used
>  like too, but in North American English it sounds formal or
>  old-fashioned.
> 
> 
> 

My question is that:

Can "*also / as well / too*" and "*always*" be in the same sentence?

Is it ok to say:

*I have already booked the flight, too*

*I have also already booked the flight.*

*I have already booked the flight, as well*