There's 2 ways to create a relationship between tables.
One is permanently with the Relationships Window (under Database Tools in Access 2010). Drag from a field in one table to a field in an other table. Then double click on the line (join) to edit the join type.
The other is to do this temporarily in A Query Builder window. Then you create the join the same way as above. This join is only set in this query only, or anything else based on this query.
OK, now that you them joined, what are your plans. One way is to create a form for editing the customer info, along with two sub-forms for editing the flight & cruise info.
Good luck