  It is commonly accepted that jets have not been observed in CVs so far. This
absence was recently explained by their low mass transfer rates compared with
objects with jets. A mass accretion limit for jets in CVs was proposed to be
about 1e-7-1e-6 Mo/yr. There was, however, a report of evidence for jets in
V1494 Aql=Nova Aql 1999/2. We estimate the mass transfer rate of this system
around the reported event and show that it is consistent with the theoretical
limit for jets. We further propose that the X-ray flare that was observed in
this object may be connected with a jet as well. The appearance of jets in
novae is actually expected since during the early decline from outburst some
are alike supersoft X-ray sources, in which jets have been found. The detection
of jets in novae also fits the suggestion that in addition to the presence of
an accretion disk, a hot central source is required for the formation of jets.
The observations of jets during the transition phase in V1494 Aql can be
regarded as evidence for the early existence of the accretion disk in the
system. This conclusion supports our previous suggestion for a link between the
transition phase in novae and the re-establishment of the accretion disk. We
further speculate that jets may be restricted to transient novae. If our ideas
are confirmed, jets should be common in transient novae and may be formed
several times during the transition phase and perhaps even long after it ends.
In classical novae jets may be launched and observed in real time. As binary
systems, these objects are easy to study. Novae may, therefore, be key systems
in understanding the formation and evolution of jets and ideal targets to test
and constrain jet theories.
