Don't pay attention to previous (childish) advices, as you may know it is impossible to judge a book by its cover, and an airline by one or two experiencies.
First of all, indeed, P5 is the only passenger airline offering scheduled flights from BOG
to LET. Avianca used to fly this route via their partern company SAM, but quit a while ago.
Yields (both cargo and passenger) on this route tend to be high, and you'll see that prices are considerably higher than fares on other type of domestic routes. I would certainly recommend that you book in advance as long as you can, and try to get a good deal with AeroRepublica to Leticia.
The airplane, an MD
-80, most of them ex-SAS, will certainly be in good shape and pretty similar to those extensively operated by american and european carriers. In case it is your first experience onboard this flight, I highly recommend a window seat because the jungle views and the approach into the Amazon and over the river can be fantastic.
It is one of the longest domestic flights here in Colombia, lasting more or less one hour and a half. It should be no problem cosidering what you usually get onboard LCC in Europe/USA for three hour flights.
AeroRepublica itself is a good competitive company that has given large leaps into modernization in the last years. They have managed to keep a significant piece of the market for themselves, and are currently an ISO9001 qualified airline operating to 11 different cities in Colombia and 1 international destination. They are Avianca's number 1 competitor in the national market, and operate MD80 aircraft on many routes where the national flagcarrier flies turboprops.
I don't know how would they handle your luggage, as all my experiences with them have been in point-to-point services, but I suggest you give them a try.
AeroRepublica currently offers up to 8 daily flights from CLO to BOG
, and a couple of service from CTG to BOG
Let us know about your experience in AeroRepublica, I'm pretty sure you'll have no problem as they are a fine company.