OPINION OF THE COURT
Aрpellant Jacqulyn Jackson appeals the District Court’s December 22, 2006 Judgment of Sentence. Following her guilty plea to one count of making false statements to police, Jackson was sentenced to six months of imprisonment and three years of supervised release. Jackson, who was released from prison during the pen-dency of this appeal, argued in her opening brief that this sentence is unreasonable.
I. FACTS
Appellant Jacqulyn Jackson was charged with making false statements to police in violation of 18 U.S.C. § 1001(a)(2). According to the facts adduced at the plea hearing and contained in the Pre-Sentence Report (PSR), Jackson attempted to obtain possession of a car seized by police following a high-speed chase; she claimed the car belonged to her and that she had reported it stolen after lending it to a friend who never returned it. In fact, Jackson knew her husband, whom police were investigating for drug trafficking, had borrowed the car and had abandoned it after being chased by the police.
On September 26, 2006, Jackson entered into a plea agreement with the Government. According to thе plea agreement, Jackson waived her right to appeal the District Court’s sentence unless the Government filed an appeal first, the sentence exceeded the statutory maximum for the offense to which she pled guilty, or the sentence unreasonably exceeded the Guidelines range determined by the District Court. See App. at 19. Following a hearing to determine whether her plea was knowing and voluntary, Jackson formally pled guilty to the charge.
The PSR, which was prepared following Jackson’s guilty plea, assigned a criminal history score of I and an offense level score of 4 after a two-level downward adjustment for substantial assistance. Given these scores, Jackson’s advisory Guidelines range was 0-6 months. This meant the advisory Guidelines called for up to six months of imprisonment, or a term of no more than three years of probation under U.S.S.G. § 5B 1.2(a)(2). The advisory Guidelines range called for a term of supervised release of at least two years, but not more than three years, which was the *237 statutory maximum. See 18 U.S.C. § 3583(b)(2); U.S.S.G. § 5D1.2(a)(2).
On December 22, 2006, after hearing arguments from both sides, including Jackson’s argument that she should be sentenced to probation, the District Court imposed a sentence оf six-months’ imprisonment. This term of imprisonment was to be followed by a three-year term of supervised release. Jackson filed a timely appeal, arguing that her sentence was unreasonable because the District Court did not give sufficient consideration to whether she should be sentenced to probation.
On February 25, 2008, this Court directed the parties to file supplemental letter-briefs addressing whether Jackson’s appeal was moot in light of the fact that she was to be released from prison the following day. On February 26, 2008, as scheduled, Jackson was released from prison, hаving completed her sentence of imprisonment. The United States Attorney filed a letter-brief in accordance with this Court’s request on March 4, 2008, and counsel for Jackson responded to our request on March 26, 2008.
II. JURISDICTION
The District Court for the Western District of Pennsylvania had subject matter jurisdiction under 18 U.S.C. § 3231. Jackson’s appeal was timely filed under Federal Rule of Appellate Procedure 4(b)(1) because it was filed within ten days of the District Court’s final judgment of sentence. Provided there is a live case or controversy in this matter, this Court has appellate jurisdiction under 28 U.S.C. § 1291 and 18 U.S.C. § 3742(a).
See Spencer v. Kemna,
III. DISCUSSION
A
We would normally begin оur analysis by discussing whether Jackson, by entering into the plea agreement, has waived her ability to appeal. However, we must first determine whether we have jurisdiction to hear Jackson’s appeal in this matter. We are required to confront a question about our jurisdiction before we can proceed to the question of whether Jackson’s waiver is enforceable.
See, e.g., United States v. Pantelidis,
In Spencer v. Kemna, the United States Supreme Court confronted the question of whether jurisdiction exists over a defendant’s appeal of his parole revocation, where the appeal reaches the appellate court after the defendant has served his sentence. The Court stated that:
This case-or-controversy requirement subsists through all stages of federal judicial proceedings, trial and appellаte .... The parties must continue to have a personal stake in the outcome of the lawsuit. This means that, throughout the litigation, the plaintiff must have suffered, or be threatened with, an actual injury traceable to the defendant and likely to be redressed by a favorable judicial decision.... An incarcerated convict’s (or a parolee’s) challenge to the validity of his conviction always satisfies the case-or-controversy requirement because the incarceration (or the restric *238 tion imposed by the terms of the parole) constitutes a concrete injury, caused by the conviction and redressable by invalidation of the conviction.... In recent decades, we have been willing to presume that a wrongful criminal conviction has continuing collateral consequences (or, what is effectively the same, to count collateral consequences that are remote and unlikely to occur).
Spencer,
A subsequent decision of our Court extended this holding to situations invоlving revocation of probation.
See United States v. Kissinger,
In
United States v. Cottman,
the defendant’s appeal challenged the method of calculating the sentence that was imposed for his violation of 18 U.S.C. § 371.
See United States v. Cottman,
Subsequent to the Supreme Court’s decision in
Spencer
and our decision in
Cott-man,
the Supreme Court decided
United States v. Johnson,
There can be no doubt that equitable considerations of great weight exist when an individual is incarcerated beyond the proper expiration of his prison term. The statutory structure provides a means to address these concerns in large part. The trial court, as it sees fit, may modify an individual’s conditions of supervised release. [18 U.S.C.] § 3583(e)(2). Furthermore, the court may terminate an individual’s supervised release obligations “at any time after the expiration of one year ... if it is satisfied that such action is warranted by the conduct of the defendant released and the interest of justice.” [18 U.S.C.] § 3583(e)(1). Respondent may invoke [18 U.S.C.] § 3583(e)(2) in pursuit of relief; and, having completed one year of supervised release, he may also seek relief under [18 U.S.C.] § 3583(e)(1).
Id.
at 60,
*240
The other factor mentioned by this Court in
Cottman,
the possible collateral consequence of a sentencing error impacting a future federal criminal conviction and sentence, has been discredited by the Supreme Court and other circuits. In
Spencer,
the appellant’s contentions that alleged errors might affect him in the future were he to be convicted of a new crime or were they to be used to impeach his testimony at a later trial were found to be too speculative to be considered collateral consequences.
See Spencer,
The defendant in Cottman was effectively challenging his sentence of imprisonment, which he had completed. Cottman did not reach the issue of whether a court would have jurisdiction if Cottman had challenged only the sentence of supervised release that he was serving while his case was on appeal. We are required to confront this issue, and the obvious answer is that a court would have jurisdiction. Under such circumstances, jurisdictional issues on account of mootness do not arise.
A defendant who was sentenced to and is serving a term of probation may appeal and challenge that probationary term, or its conditions, notwithstanding the fact that no term of imprisonment precedes the probationary term. Similarly, a defendant who was sentenced to and is serving a term of supervised release may elect to appeal only the supervised release term, or its conditions, without also appealing thе term of imprisonment that precedes the supervised release term. 3 In either situation, the defendant is merely challenging the sentence that he is serving. As succinctly stated by the Fifth Circuit:
To the extent a defendant appeals his conviction, his appeal is not moot simply because his term of imprisonment has expired.... Neither is [a defendant’s] challenge to his sentence moot because he remains subject to a term of supervised release, an element of the overall sentence. Generally, a term of supervised release is not immune to modification by the district court. A district court may have the authоrity to modify conditions of supervised release under 18 U.S.C. § 3583(e)(2), or the authority to terminate obligations of supervised *241 release, after the expiration of one year of supervised release, under [18 U.S.C.] § 3583(e)(1).
United States v. Lares-Meraz,
Under
post-Booker
jurisprudence, we review not only a term of imprisonment, but also a term of supervised release for reasonableness.
See, e.g., Maken,
To summarize Spencer’s impact, jurisdictional issues on account of mootness do not arise when a defendant who is imprisoned during the pendency of his appeal challenges his conviction or his sentence. A defendant enjoys a presumption of collateral consequences when he challenges his criminal conviction or both his criminal conviction and his sentence while he is serving a term of parole, probation, or supervised release. Accordingly, even though his imprisonment is completed, the defendant need not show that collateral consequences exist because of this presumption. The presumption of collateral consequences does not extend to challenges to the revocation of parole, probation, or supervised relеase, however.
Jurisdictional issues on account of mootness, like those addressed in Spencer, also do not arise when a defendant who is serving a term of probation challenges his sentence of probation. Similarly, if a defendant who is serving a term of supervised release elects to challenge only his sentence of supervised release, he has raised a live case or controversy under Article III such that a court will have jurisdiction over his appeal. A defendant who is serving a term of supervised release and challenges only his completed sentenсe of imprisonment must show collateral consequences. We have held, in Cottman, that the possibility of a credit for improper imprisonment against a term of supervised release is sufficient to give us jurisdiction. A defendant who is no longer serving a term of imprisonment, parole, probation, or supervised release and challenges only his sentence will have his appeal dismissed for lack of jurisdiction unless he can somehow show sufficient collateral consequences to overcome the holding in Kissinger.
As noted, Jackson has completed her term of imprisonment and is currently *242 serving a term of supervised release. In her opening brief, Jackson initially challenged only the length and reasonableness of her sentence, claiming that she should have been sentenced to only a term of probation. In her supplemental letter brief, Jackson now argues that “the only issue left for this Court to decide is whether a three year period of supervised release is reasonable.” 4 See Appellant’s Supp. Letter Br. at 1. She does not challenge her underlying conviction. Since Jackson is currently serving a term of supervised release, and because her challenge is to whether that term of supervised release is reasonable, the issues of mootness and jurisdiction addressed in Spencer and its progeny do not arise. Accordingly, we need not discuss whether collateral consequences are present, as a sufficient case or controversy exists to give this Court jurisdiction over Jackson’s appeal.
B.
Having determined that Jackson’s appeal is not moot, we must next determine whether the waiver of the right to appeal contained in Jackson’s plea agreement prohibits her from contesting the reasonableness of her sentence. In
United States v. Khattak,
we held that wаivers of appellate rights, if entered into knowingly and voluntarily, are valid.
See United States v. Khattak,
Furthermore, we have recognized that “[t]here may be an unusual circumstance where an error amounting to a miscarriage of justice may invalidate the waiver,” and in such cases we will exercise our jurisdiction over a waived appeal.
Khattak,
A few years after our decision in
Khat-tak,
the Supreme Court held that the Sentencing Guidelines were advisory in
United States v. Booker,
The initial question before us is whether Jackson’s waiver of the right to appeal her sentence was knowing and voluntary. Prior to accepting Jackson’s plea, the District Court held a hearing to discuss the prоvisions of the plea agreement with Jackson, as was required by Rule 11 of the Federal Rules of Criminal Procedure. See Fed.R.Crim.P. 11(b). During this hearing, the District Court verified that Jackson had in fact signed the plea agreement, that she had read and understood the provisions of the agreement, that she had conferred with her attorney about the agreement, and that she was in fact agreeing to plead guilty freely and voluntarily. The Court reviewed in detail the rights that Jackson was relinquishing because she was pleading guilty and confirmed that she understood these rights. The Court also reviewed the provisions of the plea agreement with Jackson and her attorney, including the waiver of the right to appeal. See App. at 46-49. The District Court’s colloquy was thorough and proper. The record thus reveals that Jackson’s plea was knowing and voluntary. She was, by her own admission, aware of the appellate waiver.
*244 Having determined Jackson’s waiver of the right to appeal to be valid, we next have to determine whether one of the specific exceptions set forth in the agreement prevents the enforcement of the waiver. It is apparent that none of the three exceptions to the waiver is implicated by Jackson’s sentence. The Government did not file an appeal prior to Jackson’s appeal. The sentence of six months does not exceed either the five-year maximum sentence prescribed by statute or the advisory Guidelines range of 0-6 months. Thus, Jackson’s appeal is not permitted by any of the specific exceptions in the plea agreement.
Because Jackson’s waiver of appeal was knowing and voluntary, and because none of the specific exceptions permits an appeal to be taken, we must next determine whether enforcing the waiver would work a miscarriage of justice.
See Khattak,
Khattak
contemplated that “unusual circumstances” could amount to a miscarriage of justice, and there may well be unusual situations in which an unreasonable sentence, standing alone, could require invalidating the waiver to avoid a miscarriage of justice. Nevertheless, in light of
Gall’s
deferential abuse-of-discretion standard for reviewing sentencing appeals, it will be a rare and unusual situation when claims of an unreasonable sentence, standing alone, will be sufficient to invalidate a waiver because of a miscarriage of justice. This case obviously does not present the “unusual circumstances” we contemplated in
Khattak.
Accordingly, we decline to exercise our jurisdiction over Jackson’s appeal, as she has waived the ability to challenge her sentence of imprisonment and supervised release.
See, e.g., United States v. Sines,
IV. CONCLUSION
We have considered all other arguments made by the parties on appeal, and we conclude that no further discussion is necessаry. For the foregoing reasons, Jackson’s appeal of her sentence is not moot. Based on Jackson’s waiver of her right to appeal, we will dismiss this appeal and thereby affirm the District Court’s judgment in all respects.
Notes
. As noted,
Spencer
provides a presumption of collateral consequences where the defendant challenges his
conviction
after he has served his prison sentence.
See Spencer,
. Case law in other circuits supports this position.
See, e.g., United States v. Lares-Meraz,
. Such an appeal would, of course, have to be taken within the time limits set forth in the Rules of Appellate Procedure for filing an appeal. See Fed. R.App. P. 4.
. In her supplemental letter brief, Jackson concedes that her prison time "cannot be restored to her," and states that she is "not asking this Court to credit any excess time she may have served in custody against her period of supervised release.” See Appellant’s Supp. Letter Br. at 1. Jackson suggests merely that the supervised release imposes restrictions on her liberty that amount to "collateral сonsequences.” See id. at 2. Because the factual circumstances of her appeal have changed since Jackson filed her opening brief and we requested supplemental briefing, we will allow Jackson to modify the specific arguments supporting her challenge to her sentence.
. Waivers frequently contain provisions allowing a defendant to appeal if the Government appeals; if the sentence exceeds a statutory maximum; if there is an erroneous upward departure, an unreasonable upward variance, or the sentence unreasonably exceeds the advisory Guidelines range; or in other specified circumstances. As previously noted, in this case Jackson was permitted to appeal if the Government appealed first, if her sentence exceeded the statutory maximum, or if her sentence unreasonably exceeded the advisory Guidelines range. See App. at 19.
.
See also Rita v. United
States,-U.S. -,
