RRGbank

To change a label, click on a node to select a different label from a list. The syntactic category and the function tag (before and after the dash "-") must be selected separately by clicking on the corresponding part of the label.
To add a function tag to a node that does not have one yet, drag it from the list of function tags onto the node.
Re-attach a node by dragging and dropping it on a new parent. This can be used to created discontinuous constituents.
Similarly, nodes can be removed and new ones added by dragging to/from below the tree.
Finally, the bracketing can be edited manually in the text box below the tree; press "validate" to update the tree. Whitespace is ignored. Each token must have a dedicated POS tag.

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Supertags

	token	arc	supertag
1	For	0	(SENTENCE (PrDP (PP (CORE_P (NUC_P (P <>)) (NP )))))
2	Cheap	4	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
3	Air	4	(NUC_N* (N <>))
4	Fares	1	(NP (CORE_N (NUC_N (N <>))))
5	,	6	(CORE* (, <>))
6	Spend	0	(SENTENCE (CLAUSE (CORE (NUC (V <>)) (NP ) (ADVP ))))
7	Christmas	6	(NP (CORE_N (NUC_N (N-PROP <>))))
8	Aloft	6	(ADVP (CORE_ADV (NUC_A (A <>))))